Python-logdog

- Support duration strings (for example `4h30m28s`)

- Check SMTP connection on `BufferedSmtpHandler` object creation

- Make flushing thread daemonic in `BaseBufferedHandler`

- Fix not clearing buffer after calling `flush()` in `BufferedGoogleChatHandler`
- Add `taskName` key support (Python 3.12+)
- Add checking Python version when using key
- Test code using multiple Python versions

- Create handlers
- `GoogleChatHandler`
- `BufferedGoogleChatHandler`
- `BufferedSmtpHandler`

- Create formatters
- `LogfmtFormatter`
- `JsonFormatter`
- Rename Renderer to Encoder
- Code refactor
- Create documentation using `mkdocs`