feat: add annotation RequestCachePolicy

[philprime]

No description provided.

[github-actions]

	Warnings
⚠️	The library files were changed, but the tests remained unmodified. Consider updating or adding to the tests to match the library changes.

Generated by 🚫 Danger Swift against 98783ec

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 73.68421% with 5 lines in your changes missing coverage. Please review.

Project coverage is 59.04%. Comparing base (a01ef75) to head (98783ec).

Files with missing lines	Patch %	Lines
...rces/Postie/Configuration/RequestCachePolicy.swift	42.85%	4 Missing ⚠️
Sources/Postie/Encoder/RequestEncoding.swift	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
+ Coverage   58.87%   59.04%   +0.17%     
==========================================
  Files          65       66       +1     
  Lines        1612     1631      +19     
==========================================
+ Hits          949      963      +14     
- Misses        663      668       +5     

Flag	Coverage Δ
unittests	59.04% <73.68%> (+0.17%)	⬆️

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