Port diesel-cli argument parsing from clap builders to clap derives

Diesel-cli is a relatively old application. It was written at a time when clap did not ship a derive. This now changed on the upstream side (since quite some time). Using the derive allows to more easily change/add arguments and documentation to the CLI tool, therefore we would like to move our old argument parsing code over to use the clap derive macro. Hopefully this also makes handling CLI arguments in our application easier as they are then type safe. This needs to keep the old command line interface

The relevant code is here

https://github.com/diesel-rs/diesel/blob/a7061cc602e9dd69f889236f3c66220239c9313e/diesel_cli/src/cli.rs

Relevant documentation:

• Clap Builder reference (old code)
• Clap Derive reference (new code)