Vkpymusic

Changes:
- Add `UserInfo` to `vkpymusic.models`;
- Create new `Converter` from `Response` to `UserInfo`;
- Change logic `Service(Async).get_user_info()` from 3 fields to all fields;
- `TokenReceiver(Async)` methods now have open methods for auth step by step;
- Add docs for `TR(Async)`.

Changes:
- Refactor;
- Add fields for `model`s for `pydantic`;
- Add fiels `followers` for `Playlist`, that show count of adding playlist;
- Update `LICENSE`

Changes:
- Fix error with `Playlist` without `photo`

Changes:
- Add token validation in `Service` and `ServiceAsync`;
- Add static token validation;
- Add `.get_user_info()` in `Service` and `ServiceAsync`;
- Refactor function's names to `snake_case`;
- Update `example`;
- Update `docs`.

Changes:
- Move `Song` and `Playlist` to `/models`;
- Fix bug with `json` and `Converter`s;
- Add def `check_token()` in `Service(Async)`;
- Update `docs`.

Changes:
- full refactoring imports
- add `utils` with `Converter` and `Logger`
- fix async funcs and classes