enh: refactor setTag and removeTag to FFI/JNI

[buenaflor]

📜 Description

Part of moving away from method channels

💡 Motivation and Context

Partly completes #3204

💚 How did you test it?

Manual, integration tests

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[github-actions]

🚨 Detected changes in high risk code 🚨

High-risk code has higher potential to break the SDK and may be hard to test. To prevent severe bugs, apply the rollout process for releasing such changes and be extra careful when changing and reviewing these files:

• packages/flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.57%. Comparing base (d3fb366) to head (26a35ec).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3313      +/-   ##
==========================================
+ Coverage   88.13%   89.57%   +1.44%     
==========================================
  Files         295       99     -196     
  Lines       10120     3406    -6714     
==========================================
- Hits         8919     3051    -5868     
+ Misses       1201      355     -846     

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