✨ add PEP563 support

[wu-clan]

• Add PEP563 support
• Update some code features to be compatible with python 3.8
• Fix some test bugs

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.69 🎉

Comparison is base (1947b22) 97.34% compared to head (b3a97b4) 98.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
+ Coverage   97.34%   98.03%   +0.69%     
==========================================
  Files          15       15              
  Lines         301      306       +5     
==========================================
+ Hits          293      300       +7     
+ Misses          8        6       -2     

Impacted Files	Coverage Δ
fastapi_class/exception/__init__.py	100.00% <ø> (ø)
fastapi_class/exception/handler.py	100.00% <100.00%> (ø)
fastapi_class/openapi.py	100.00% <100.00%> (ø)
fastapi_class/routers.py	98.00% <100.00%> (+0.04%)	⬆️
fastapi_class/views.py	96.87% <100.00%> (+5.69%)	⬆️
tests/test_exceptions.py	100.00% <100.00%> (ø)
tests/test_metadata.py	100.00% <100.00%> (ø)
tests/test_routers.py	100.00% <100.00%> (ø)
tests/test_views.py	91.48% <100.00%> (+0.18%)	⬆️

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[yezz123]

Thank you @wu-clan 🙏🏻