Standardize error codes and messages for error class `ClassExpression`

Development Task

Add workaround for errors which belong to ClassExpression

This task need to add description and workaround for these errors:

position: expression/errors.go

• ErrIncorrectParameterCount
• ErrDivisionByZero
• ErrRegexp
• ErrOperandColumns
• ErrCutValueGroupConcat
• ErrFunctionsNoopImpl
• ErrIncorrectType
• errFunctionNotExists
• errZlibZData
• errZlibZBuf
• errIncorrectArgs
• errUnknownCharacterSet
• errDefaultValue
• errDeprecatedSyntaxNoReplacement
• errBadField(expression/errors.go#42)
• errWarnAllowedPacketOverflowed
• errWarnOptionIgnored
• errTruncatedWrongValue
• errUnknownLocale
• errNonUniq
• errSequenceAccessDenied
• errTooBigPrecision(planner/core/errors/go#71)
• ErrIllegalMixCollation(util/collate.go#39)

Here is a example:

[error.9005]
error = '''Region is unavailable'''
description = '''
A certain Raft Group is not available, such as the number of replicas is not enough.
This error usually occurs when the TiKV server is busy or the TiKV node is down.
'''
workaround = '''Check the status, monitoring data and log of the TiKV server.'''

Error code and error message has been saved when the error registered. So just need a description to describe what happen when this error occur and a workaround to let user know how to deal with it.