Asyncgelf

- Added timestamp GELF parameter [16](https://github.com/malinkinsa/asyncgelf/pull/16) MaKeG0

- Support for data in list format for TCP. This allows sending multiple messages as a list instead of opening a new socket for each individual message. This could potentially improve the efficiency of TCP by reducing the overhead associated with socket establishment and teardown for each message;
- Support compression level;

**No changes in library code**
- Tested working with Python 3.11;
- Updated setup.py classifier block;
- Added badge with python version from pypi page;

- Fixed validation for additional fields

Added key for resolving bug with UDP handler

- Support compress to tcp handler;
- Support additional field;