feat(options): Add before_send_feedback hook

[limbonaut]

Adds sentry_options_set_before_send_feedback, so user feedback can be modified or discarded before it is sent. The hook runs after the local and global scopes have been applied, so the callback sees the same feedback event that would otherwise be sent.

• Closes Add before_send_feedback hook #1921

The callback also receives the capture's hint and can attach files to that single feedback. A hint is created for the callback when the caller did not pass one, so this works across all three capture functions. Returning sentry_value_new_null() discards the feedback and records a feedback client report.

[codecov]

Codecov Report

❌ Patch coverage is 97.14286% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 75.80%. Comparing base (5bac907) to head (c320c75).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1923      +/-   ##
==========================================
+ Coverage   75.74%   75.80%   +0.06%     
==========================================
  Files          93       93              
  Lines       22128    22149      +21     
  Branches     3939     3942       +3     
==========================================
+ Hits        16760    16791      +31     
+ Misses       4484     4477       -7     
+ Partials      884      881       -3     

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[github-actions]

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