feat: Manually capturing User Feedback

[philipphofmann]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

The SDK now provides a method captureUserFeedback to associate user
feedback to an event.

💡 Motivation and Context

We want to bring this feature to our users.

💚 How did you test it?

Unit tests and simulator.

📝 Checklist

• I reviewed the submitted code
• I added tests to verify changes
• All tests passing
• No breaking changes

🔮 Next steps

Add this to docs.

[codecov-io]

Codecov Report

Merging #1017 into main will increase coverage by 0.32%.
The diff coverage is 83.82%.

@@ Coverage Diff @@## main #1017 +/- ##
============================================
+ Coverage 71.61% 71.94% +0.32% - Complexity 1299 1319 +20 
============================================
Files 134 135 +1 Lines 4731 4808 +77 Branches 490 491 +1 ============================================
+ Hits 3388 3459 +71 - Misses 1087 1091 +4 - Partials 256 258 +2 

Impacted Files	Coverage Δ	Complexity Δ
sentry/src/main/java/io/sentry/HubAdapter.java	10.20% <0.00%> (-0.44%)	4.00 <0.00> (ø)
sentry/src/main/java/io/sentry/IHub.java	83.33% <ø> (ø)	6.00 <0.00> (ø)
sentry/src/main/java/io/sentry/ISentryClient.java	88.88% <ø> (ø)	9.00 <0.00> (ø)
sentry/src/main/java/io/sentry/NoOpHub.java	55.17% <0.00%> (-1.98%)	16.00 <0.00> (ø)
...ntry/src/main/java/io/sentry/NoOpSentryClient.java	55.55% <0.00%> (-6.95%)	5.00 <0.00> (ø)
sentry/src/main/java/io/sentry/NoOpSerializer.java	36.36% <0.00%> (-8.09%)	4.00 <0.00> (ø)
sentry/src/main/java/io/sentry/Hub.java	65.61% <71.42%> (+0.55%)	61.00 <2.00> (+2.00)
...ry/src/main/java/io/sentry/SentryEnvelopeItem.java	85.71% <88.88%> (+0.93%)	15.00 <2.00> (+2.00)
sentry/src/main/java/io/sentry/GsonSerializer.java	100.00% <100.00%> (ø)	14.00 <2.00> (+2.00)
sentry/src/main/java/io/sentry/Sentry.java	44.80% <100.00%> (+0.89%)	18.00 <1.00> (+1.00)
... and 9 more

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[marandaneto]

I've made a few comments but other than that looks good :) well done!