Refactor FragmentAPI to pyfragment

- Renamed the package from `fragmentapi` to `pyfragment` across all modules and tests.
- Removed the old wallet utility functions and replaced them with new implementations.
- Updated the `pyproject.toml` to reflect the new package name and repository links.
- Adjusted all import statements in tests to use the new package name.
- Implemented new methods for gifting Telegram Premium, Stars, and topping up TON balance.
- Added exception handling for various error scenarios in the API interactions.
- Created new utility functions for handling HTTP requests and decoding payloads.
- Established a clear structure for types and constants used throughout the library.

tests/001_test_decode.py

@@ -4,8 +4,8 @@ import re
 
 import pytest
 
-from fragmentapi.types import ParseError
-from fragmentapi.utils.decoder import clean_decode
+from pyfragment.types import ParseError
+from pyfragment.utils.decoder import clean_decode
 
 PAYLOADS = [
     pytest.param(