include format with secret types

[Atheuz]

Change Summary

include 'format': 'password' in the schema for secret types.

Related issue number

#546

Checklist

• Unit tests for the changes exist
• Tests pass on CI and coverage remains at 100%
• Documentation reflects the changes where applicable
• changes/1424-atheuz.md file added describing change

[codecov]

Codecov Report

Merging #1424 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1424   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines         3747      3747           
  Branches       742       742           
=========================================
  Hits          3747      3747           

Impacted Files	Coverage Δ
pydantic/types.py	100.00% <100.00%> (ø)

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[Atheuz]

Relates to #546

[samuelcolvin]

thanks a lot.