💡 Feature Request: Ability to use database-type sources, such as `source-postgres` and `source-mysql`

Because most database sources are built on Java, they currently are not able to run in Python environments.

This feature would allow database-type sources to be run from PyAirbyte. Possible implementation options could be:

1. Allow docker containers to be invoked by Airbyte.
- **Important:** While this _technically_ is not a big lift, not sure if we want to take this approach - as it would create a very sharp difference in user experience for those runtimes which have docker access, versus those which do not.
2. Find a way to package and install Java connectors as standalone executables.
- This is in theory _also_ technically feasible, but this approach is subject to its own sharp edges - such as needing to have pre-built Java executables for `n` number of platforms/runtimes.

## Available Workarounds

### Workaround # 1: Pre-Installing the Java-based connector

One workaround is to pre-install the Java-based connector on your local machine or docker image, and then create a CLI which can mimic the CLI of a Python-based connector. If registered on PATH, PyAirbyte will find this connector and not know/care what language it is written in.

### Workaround # 2: Treating the source DB as an externally-managed "cache"

An alternative workaround, which admittedly would not solve all use cases, would be what is described in this issue:

- #85