chore: Helper methods to deserialize payloads from Base 64

[Stranger6667]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #2163 will not alter performance

_{Comparing dd/add-helpers (d0d83e6) with master (da74bc0)}

Summary

✅ 2 untouched benchmarks

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 98.33%. Comparing base (da74bc0) to head (d0d83e6).

Files	Patch %	Lines
src/schemathesis/cli/junitxml.py	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2163   +/-   ##
=======================================
  Coverage   98.33%   98.33%           
=======================================
  Files         131      131           
  Lines       10941    10947    +6     
  Branches     2294     2295    +1     
=======================================
+ Hits        10759    10765    +6     
  Misses        103      103           
  Partials       79       79           

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