[FLINK-37300][common] Add RawDataType to represent the type in data sources

[whhe]

This closes FLINK-37300.

In this PR, I added RawDataType and JdbcRawDataType to represent the original data type in data sources, and made some changes to the base DataType class:

1. Added a new copy method copy(boolean isNullable, RawDataType rawDataType), all external calls to copy method should use it directly or indirectly.
2. Added a new toString method asSerializableStringWithRawDataType, asSummaryString will change to use it by default.
3. To avoid incorrect calls to the original copy(boolean isNullable) and asSerializableString method, I changed them to protected.

[whhe]

Many test cases are modified because the newly added rawDataType field in DataType class, and now these test cases generally pass. PTAL @leonardBang @yuxiqian

[leonardBang]

ok，nice work @whhe