feat(AndroidManifest): explicitly define the activity attribute android:exported

[erisu]

Motivation and Context

Explicitly define the android:exported attribute on the Activty within the AndroidManifest.

Previously, this attribute did not need to be explicitly defined but start in Android 12 it will need to be.

Warning: If an activity, service, or broadcast receiver uses intent filters and doesn't have an explicitly-declared value for android:exported, your app can't be installed on a device that runs Android 12 or higher.

It is safe to add this to the current major as it does not introduce a breaking change.

Description

Adds the android:exported="true" to the activity attribute

Testing

• build test with build-tools 30.0.3
• build test with build-tools 31.0.0

Checklist

• I've run the tests to see all new and existing tests pass

[codecov-commenter]

Codecov Report

Merging #1372 (a6bafb7) into master (05e3e3c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1372   +/-   ##
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  Coverage   73.15%   73.15%           
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  Files          21       21           
  Lines        1643     1643           
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  Hits         1202     1202           
  Misses        441      441           

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