Refactor logging

[tiangolo]

🔊 Refactor logging.

• Use the same logger everywhere to make sure the custom fastapi logger is used.
• Update logging strings to fix format.
• Update log level of email-validator errors to INFO, not WARNING.

[codecov]

Codecov Report

Merging #781 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #781   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         276    277    +1     
  Lines        7208   7210    +2     
=====================================
+ Hits         7208   7210    +2

Impacted Files	Coverage Δ
fastapi/logger.py	100% <100%> (ø)
fastapi/openapi/models.py	100% <100%> (ø)	⬆️
fastapi/routing.py	100% <100%> (ø)	⬆️
fastapi/encoders.py	100% <100%> (ø)	⬆️
fastapi/utils.py	100% <100%> (ø)	⬆️

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