Report explicit error message for missing properties in S3PinotFS

Reported by the community: When user not specify the config region, pinot should give correct stacktrace in the logging for missing config: region. The code: Preconditions.checkArgument(!isNullOrEmpty(config.getProperty(REGION))); is not user-friendly as it's not giving an actionable and informative message.

Right now: the logs is very unclear like:

2021/02/11 11:37:06.847 ERROR [PinotFSFactory] [Start a Pinot [SERVER]] Could not instantiate file system for class org.apache.pinot.plugin.filesystem.S3PinotFS with scheme s3                                                
java.lang.IllegalArgumentException: null
        at shaded.com.google.common.base.Preconditions.checkArgument(Preconditions.java:108) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                                       
        at org.apache.pinot.plugin.filesystem.S3PinotFS.init(S3PinotFS.java:83) ~[pinot-s3-0.6.0-shaded.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]
        at org.apache.pinot.spi.filesystem.PinotFSFactory.register(PinotFSFactory.java:54) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                                         
        at org.apache.pinot.spi.filesystem.PinotFSFactory.init(PinotFSFactory.java:74) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                                             
        at org.apache.pinot.server.starter.helix.SegmentFetcherAndLoader.<init>(SegmentFetcherAndLoader.java:71) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                   
        at org.apache.pinot.server.starter.helix.HelixServerStarter.start(HelixServerStarter.java:316) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                             
        at org.apache.pinot.tools.service.PinotServiceManager.startServer(PinotServiceManager.java:150) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                            
        at org.apache.pinot.tools.service.PinotServiceManager.startRole(PinotServiceManager.java:95) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                               
        at org.apache.pinot.tools.admin.command.StartServiceManagerCommand$1.lambda$run$0(StartServiceManagerCommand.java:260) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]     
        at org.apache.pinot.tools.admin.command.StartServiceManagerCommand.startPinotService(StartServiceManagerCommand.java:286) [pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]   
        at org.apache.pinot.tools.admin.command.StartServiceManagerCommand.access$000(StartServiceManagerCommand.java:57) [pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]           
        at org.apache.pinot.tools.admin.command.StartServiceManagerCommand$1.run(StartServiceManagerCommand.java:260) [pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]               
2021/02/11 11:37:06.851 ERROR [StartServiceManagerCommand] [Start a Pinot [SERVER]] Failed to start a Pinot [SERVER] at 0.883 since launch
java.lang.RuntimeException: java.lang.IllegalArgumentException                                                 
        at org.apache.pinot.spi.filesystem.PinotFSFactory.register(PinotFSFactory.java:58) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                                         
        at org.apache.pinot.spi.filesystem.PinotFSFactory.init(PinotFSFactory.java:74) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                                             
        at org.apache.pinot.server.starter.helix.SegmentFetcherAndLoader.<init>(SegmentFetcherAndLoader.java:71) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                   
        at org.apache.pinot.server.starter.helix.HelixServerStarter.start(HelixServerStarter.java:316) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                             
        at org.apache.pinot.tools.service.PinotServiceManager.startServer(PinotServiceManager.java:150) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                            
        at org.apache.pinot.tools.service.PinotServiceManager.startRole(PinotServiceManager.java:95) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                               
        at org.apache.pinot.tools.admin.command.StartServiceManagerCommand$1.lambda$run$0(StartServiceManagerCommand.java:260) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]     
        at org.apache.pinot.tools.admin.command.StartServiceManagerCommand.startPinotService(StartServiceManagerCommand.java:286) [pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]   
        at org.apache.pinot.tools.admin.command.StartServiceManagerCommand.access$000(StartServiceManagerCommand.java:57) [pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]           
        at org.apache.pinot.tools.admin.command.StartServiceManagerCommand$1.run(StartServiceManagerCommand.java:260) [pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]               
Caused by: java.lang.IllegalArgumentException
        at shaded.com.google.common.base.Preconditions.checkArgument(Preconditions.java:108) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                                       
        at org.apache.pinot.plugin.filesystem.S3PinotFS.init(S3PinotFS.java:83) ~[pinot-s3-0.6.0-shaded.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]
        at org.apache.pinot.spi.filesystem.PinotFSFactory.register(PinotFSFactory.java:54) ~[pinot-all-0.6.0-jar-with-dependencies.jar:0.6.0-bb646baceafcd9b849a1ecdec7a11203c7027e21]                                         
        ... 9 more