Telegram-payment-bot

- Update Python versions

- Fix replying to commands in topics

- Add support for service accounts (`payment_google_cred_type`)
- Add possibility to specify the worksheet index in config (`payment_worksheet_idx`)

- Minor bug fix (passing not-existent variable as parameter)

- Migrate Google OAuth flow after deprecation

- Fix some _mypy_ and _prospector_ warnings
- Add configuration for _isort_ and run it on project