chore: Pass custom formats to strategy factories

[Stranger6667]

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[codecov-commenter]

Codecov Report

Merging #1421 (f203874) into master (16171c0) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1421      +/-   ##
==========================================
- Coverage   99.16%   99.10%   -0.07%     
==========================================
  Files          84       84              
  Lines        6487     6487              
  Branches     1138     1138              
==========================================
- Hits         6433     6429       -4     
- Misses         27       29       +2     
- Partials       27       29       +2     

Flag	Coverage Δ
unittests	99.09% <100.00%> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
src/schemathesis/specs/openapi/_hypothesis.py	100.00% <100.00%> (ø)
src/schemathesis/runner/impl/threadpool.py	98.23% <0.00%> (-1.77%)	⬇️
src/schemathesis/cli/callbacks.py	98.33% <0.00%> (-1.67%)	⬇️

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