Fix _metadata population

[prayansh]

Our previous implementation was lacking a little, causing issues with sending data to destinations on cloud-mode.

These changes should now incorporate the list of active destinations and mark them as unbundled if no device-mode equivalent is present.

[wenxi-zeng]

LGTM. couple minor optimizations:

1. make bundled as a set first. so bundled.contains becomes an O(1) operation, and filter + contains is O(n). otherwise it is O(mn).
2. make unbundled as a set first. so we don't have to do a union at the end, saves m+n operations, otherwise, it's 2*(m+n).

[codecov-commenter]

Codecov Report

Base: 78.00% // Head: 83.84% // Increases project coverage by +5.83% 🎉

Coverage data is based on head (25dc8a0) compared to base (faf431b).
Patch coverage: 85.71% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #114      +/-   ##
============================================
+ Coverage     78.00%   83.84%   +5.83%     
+ Complexity      442      429      -13     
============================================
  Files            64       56       -8     
  Lines          5705     4901     -804     
  Branches        719      639      -80     
============================================
- Hits           4450     4109     -341     
+ Misses          693      256     -437     
+ Partials        562      536      -26     

Impacted Files	Coverage Δ
...core/platform/plugins/DestinationMetadataPlugin.kt	81.25% <73.33%> (+9.82%)	⬆️
...platform/plugins/DestinationMetadataPluginTests.kt	91.17% <90.24%> (-0.63%)	⬇️
...analytics/kotlin/android/AndroidAnalyticsKtTest.kt
.../analytics/kotlin/android/utils/MockPreferences.kt
.../segment/analytics/kotlin/android/utils/Plugins.kt
...m/segment/analytics/kotlin/android/StorageTests.kt
...ics/kotlin/android/AndroidContextCollectorTests.kt
...egment/analytics/kotlin/android/EventsFileTests.kt
...om/segment/analytics/kotlin/android/utils/Mocks.kt
...tics/kotlin/android/AndroidLifecyclePluginTests.kt

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