[cdc] fix paimon cdc job restart failed when schema changed

[MOBIN-F]

Purpose

Restarting the flink-paimon-cdc job schemaCompatible failed when the column change/add between the stop and restart of the flink-paimon-cdc job

1. In cdc-postgresql, for the newly added fields, because debezium-postgresql has no DDL events, the newly added fields can only be parsed from the records, and char and varchar fields are both STRING types in debezium-postgresql, so both char and varchar are converted to STRING in cdc-postgresql.

Tests

API and Format

Documentation

[MOBIN-F]

can you help review this pr? tks @JingsongLi

[JingsongLi]

CC @yuzelin

[yuzelin]

Hello, can you solve the conflicts ?

[MOBIN-F]

Hello, can you solve the conflicts ?

done,please help to review this PR, thanks. @yuzelin