benefiting of manifest merging when minSdk < 21

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

benefiting of manifest merging when minSdk < 21

💡 Motivation and Context

if you wanna support NDK >= 21 but also to support Android SDK < 21, you need to set this merging strategy.

  <uses-sdk
    tools:overrideLibrary="io.sentry.android, io.sentry.android.ndk"/>

with this PR, you just need:

  <uses-sdk
    tools:overrideLibrary="io.sentry.android"/>

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing

🔮 Next steps