Pyscopg3 port

[danidee10]

TODO

• Replace aiopg with pyscopg3
• Replace setup.py with pyproject.toml
• Standardize code with pylint and mypy
• Fix reported issues from pylint and mypy
• Update documentation

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[Copilot]

Copilot reviewed 17 out of 19 changed files in this pull request and generated 1 comment.

Files not reviewed (2)

• setup.cfg: Language not supported
• tox.ini: Language not supported

[Copilot]

The base64 decoding of 'base64_message' is performed twice consecutively in the '_get_message_from_channel' method. Consider decoding once and reusing the result to improve efficiency.

Suggested change

	message = (base64.b64decode(base64_message),)
	if float(timestamp) < time.time():
	continue
	message = (base64.b64decode(base64_message),)
	decoded_message = base64.b64decode(base64_message)
	message = (decoded_message,)
	if float(timestamp) < time.time():
	continue
	message = (decoded_message,)