community[patch]: allow to use postgres pool instance on PostgresRecordManager

[josemussa]

This is a proposal to support passing an instance of Pool when instantiating PostgresRecordManager. This would enable the reuse of an existing database connection pool.

import pg from "pg";

const pool = new pg.Pool(postgresConnectionOptions);

const providedPoolRecordManager = new PostgresRecordManager("test", {
  ...config,
  pool,
});

Fixes # (issue)
#5676

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[jacoblee93]

Thank you! Sorry about the wait!

[biswarup-banerjee]

@josemussa This is a really helpful fix! Thanks for this! Really cool!