feat: Automatic masking of sensitive data in the output by default

[Stranger6667]

Resolves #1794

TODO:

• Write more unit tests for masking logic
• Document that response payloads are not masked (the reason is that I think we need to keep the format of the original response - key sorting, indentation, etc)
• Apply to the pytest integration
• Write top-level test cases specifically for output masking
• Tests for masking data in cassettes
• Check if any "masking" function could be removed
• More unit tests
• Bikeshed naming more
• More reliable test for cassettes - it could have weird chars there
• Document MaskingConfig as a public API

[codecov]

Codecov Report

Merging #1842 (b0197c9) into master (8ea9833) will increase coverage by 0.01%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1842      +/-   ##
==========================================
+ Coverage   98.94%   98.96%   +0.01%     
==========================================
  Files         103      105       +2     
  Lines        8655     8792     +137     
  Branches     1786     1824      +38     
==========================================
+ Hits         8564     8701     +137     
  Misses         52       52              
  Partials       39       39              

Files	Coverage Δ
src/schemathesis/cli/__init__.py	99.26% <100.00%> (+<0.01%)	⬆️
src/schemathesis/cli/sanitization.py	100.00% <100.00%> (ø)
src/schemathesis/lazy.py	91.81% <100.00%> (+0.04%)	⬆️
src/schemathesis/models.py	98.44% <100.00%> (+0.01%)	⬆️
src/schemathesis/runner/impl/core.py	97.21% <100.00%> (+0.01%)	⬆️
src/schemathesis/sanitization.py	100.00% <100.00%> (ø)
src/schemathesis/schemas.py	99.45% <100.00%> (+<0.01%)	⬆️
src/schemathesis/specs/graphql/loaders.py	98.88% <ø> (ø)
src/schemathesis/specs/openapi/loaders.py	98.84% <ø> (ø)