Add FFE SDK owners to flag module

[leoromanovsky]

Motivation

FFE SDK engineers should be requested on changes to the Android feature flag SDK module.

Changes

• Add @DataDog/feature-flags-sdks as a CODEOWNER for /features/dd-sdk-android-flags-openfeature/.
• Keep the existing RUM mobile and Android mobile owners on that module.
• Preserve documentation ownership on the module README.md while adding FFE SDK ownership there too.

Decisions

• Targeted develop because this repository does not have a main branch.
• No runtime tests were run; this is a CODEOWNERS-only change. Validated with git diff --check.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.21%. Comparing base (609305e) to head (1783529).
⚠️ Report is 8 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3530      +/-   ##
===========================================
- Coverage    72.23%   72.21%   -0.02%     
===========================================
  Files          965      965              
  Lines        35635    35633       -2     
  Branches      5947     5948       +1     
===========================================
- Hits         25740    25730      -10     
+ Misses        8286     8282       -4     
- Partials      1609     1621      +12     

see 45 files with indirect coverage changes

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[dd-octo-sts-4191dd]

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