RUM-14330: Optimizations to reduce .so file

[kikoveiga]

What does this PR do?

• Adds compiler and linker size optimizations to the NDK module's CMake configuration, reducing the .so file size by around 50%.
• Minor code cleanups (remove unused imports, CLion suggestions)

Motivation

The .so for arm64-v8a was ~860 KB — larger than the SDK's APK footprint (~570 KB) without the ndk.

Below are analysis of this file inside the Sample app release APK done in Android Studio, describing Size on the left and Download Size on the right.

Before (sample app release APK on develop branch):

After (with these optimizations):

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.29%. Comparing base (da85551) to head (5c41110).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3190      +/-   ##
===========================================
- Coverage    71.31%   71.29%   -0.02%     
===========================================
  Files          929      929              
  Lines        34442    34442              
  Branches      5813     5813              
===========================================
- Hits         24562    24554       -8     
- Misses        8247     8250       +3     
- Partials      1633     1638       +5     

see 39 files with indirect coverage changes

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[0xnm]

If everything works in Release build and NDK crash is captured and sent, then all good 👍

[0xnm]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Bravo.

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[kikoveiga]

@0xnm the compiler was optimizing and removing the code of sigsegv and sigill ndk crashes (even before my changes) in release builds, so the buttons on the sample app didn't work. Simplified this and confirmed NDK crashes are being sent to Datadog and working fine.

[0xnm]

Can you explain the need for this change? raise indeed will raise the necessary signal, but the code here is to illustrate the real example leading to the particular signal.

[0xnm]

one thing to check for release builds: once NDK crash happens and if Datadog NDK makes a part of the stacktrace, can we still symbolicate such frames after binary shrinking?