[core] Support lock for postgres catalog (#4836)

[pratikd650]

Purpose

Linked issue: close #4836

Currently lock.enabled is only supported my SQLLite and MySQL. Adding support for Postgres.
The only difference between MySQL and Postgres is the TIMESTAMPDIFF function

In MySQL
DELETE FROM paimon_distributed_locks WHERE TIMESTAMPDIFF(SECOND, acquired_at, NOW()) > expire_time_seconds and lock_id = ?

In Postgres
DELETE FROM paimon_distributed_locks WHERE EXTRACT(EPOCH FROM AGE(NOW(), acquired_at)) > expire_time_seconds and lock_id = ?

Tests

PostgresqlCatalogTest.java. This uses TestContainers with postgres:13-alpine to run postgres inside docker.

API and Format

No

Documentation

Yes ,The doc at https://paimon.apache.org/docs/master/flink/sql-ddl/#creating-jdbc-catalog says

Currently, lock configuration is only supported for MySQL and SQLite. If you are using a different type of database for catalog storage, please do not configure lock.enabled.

This needs to updated to include Postgres

[JingsongLi]

Looks good to me!