Add standard claims verification

[tokusumi]

Add more standard claims verification. Listed in:

• Auth0 access token: https://auth0.com/docs/tokens/access-tokens/validate-access-tokens
• Auth0 ID token: https://auth0.com/docs/tokens/id-tokens/validate-id-tokens
• AWS Cognito: https://docs.aws.amazon.com/cognito/latest/developerguide/amazon-cognito-user-pools-using-tokens-verifying-a-jwt.html#amazon-cognito-user-pools-using-tokens-step-3
• Firebase: https://firebase.google.com/docs/auth/admin/verify-id-tokens#verify_id_tokens_using_a_third-party_jwt_library

Breaking changes:

• most exception status code turns to 401_UNAUTHORIZED from 403_FORBIDDEN
• MUST add some arguments for claims verification (See README)

[codecov[bot]]

Codecov Report

Merging #45 (d0a5e00) into master (ae024ed) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master       #45    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           11        11            
  Lines          786      1023   +237     
==========================================
+ Hits           786      1023   +237     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
fastapi_cloudauth/base.py	100.00% <100.00%> (ø)
fastapi_cloudauth/verification.py	100.00% <100.00%> (ø)
tests/helpers.py	100.00% <100.00%> (ø)
tests/test_auth0.py	100.00% <100.00%> (ø)
tests/test_cloudauth.py	100.00% <100.00%> (ø)
tests/test_cognito.py	100.00% <100.00%> (ø)
tests/test_firebase.py	100.00% <100.00%> (ø)
tests/test_verification.py	100.00% <100.00%> (ø)

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