He Wang

### Self Checks - [x] I have searched for existing issues [search for existing issues](https://github.com/infiniflow/ragflow/issues), including closed ones. - [x] I confirm that I am using English to submit this...

cleanup config and move config loading to connection init method

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### What problem does this PR solve? Now the database is started at `api/settings.py`, but the configuration loading is in `rag/settings.py`, so there are two branch judgment logic. In this...

[FLINK-37293][pipeline-connector][oceanbase] Fix type converting and refactoring test cases

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This closes [FLINK-37293](https://issues.apache.org/jira/browse/FLINK-37293)

This closes [FLINK-36024](https://issues.apache.org/jira/browse/FLINK-36024).

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

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This closes [FLINK-37300](https://issues.apache.org/jira/browse/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....