webfinger and example update

examples/federation_example.py

examples/note_example.py

src/pyfed/.DS_Store

src/pyfed/federation/resolver.py

src/pyfed/protocols/webfinger.py

src/pyfed/security/interfaces.py

src/pyfed/security/rate_limiter.py

src/pyfed/security/validators.py

src/pyfed/security/webfinger.py

tests/pytest.ini