feat: add postgres support

[Kidus-AA]

This PR is to close issue #28 (Add Postgres Support)

✔️ Checklist

Adds support for interacting with PostgreSQL databases:

• Inserting pandas/polars DataFrames directly into Postgres tables, with automatic table creation and batch inserts.
• Flexible support for both psycopg2 and pg8000 DBAPI drivers.
• Connection management, SQL execution, and error handling

Testing:

• Unit tests using mocks for both DBAPI drivers.
• Integration tested against a local Postgres instance.

[fdosani]

@Kidus-AA Thanks for the PR, would you be able to run ruff against your code to ensure all the linting checks pass please.

[fdosani]

@Kidus-AA wondering if you would still like to proceed with this PR? Will leave it open for a couple of more days and then close it as stale if not.