[FLINK-37300][common] Add RawDataType to represent the type in data sources #3923
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This closes FLINK-37300.
In this PR, I added
RawDataTypeandJdbcRawDataTypeto represent the original data type in data sources, and made some changes to the baseDataTypeclass:copy(boolean isNullable, RawDataType rawDataType), all external calls to copy method should use it directly or indirectly.copy(boolean isNullable)method, I changed it to aprotected.