feat(gaussdb-node): 增加 OpenGauss 逻辑复制支持 #20
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- Add endian parameter ('be' | 'le'), default 'be' for backward compatibility
- Add uint16(), peekByte(), uint64Parts(), remaining() methods
- Support text (t), JSON (j), binary (b) decode styles - Support batch and non-batch modes - Parse BEGIN/COMMIT/INSERT/UPDATE/DELETE operations
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LogicalReplicationService，封装OpenGauss逻辑复制连接与消息流处理MppdbDecodingPlugin，支持t/json/b decode、解析BEGIN/COMMIT/INSERT/UPDATE/DELETEopenGauss只支持mppdb_decoding，所以只实现了这个插件openGauss-connector-jdbc/pgjdbc/src/main/java/org/postgresql/core/v3/replication/V3PGReplicationStream.java