feat: add fragment lifecycle breadcrumb logger

[wzieba]

📜 Description

This PR adds a new module sentry-android-fragment which exposes a new Integration for automated Android's Fragments lifecycles breadcrumb logging.

Sample

💡 Motivation and Context

Closes: #1374

From suggested solutions by @marandaneto , I've liked

Maybe installing a new ActivityFragmentLifecycleIntegration that relies on androidx.fragment.app and then calling activity.getSupportFragmentManager(), to add and remove the FragmentLifecycleIntegration callback.
this would likely require a new package as the SDK does not depend on the fragments package, like sentry-android-fragment module.

the most, so I've followed it in this implementation.

It's also highly inspired by ActivityLifecycleIntegration.

💚 How did you test it?

Aside from unit tests, I've tested it manually using a sample project. To do this, uncomment manual initialization in MyApplication, add a test DSN, run app and click on Open sample fragment button.

From there you can send a message from inner fragment to check if breadcrumbs logging works for nested fragments too.

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• No breaking changes

🔮 Next steps

[marandaneto]

@wzieba nicely done, thanks a lot, left a few comments only the Java or Kotlin would be a question to be answered, all the rest are easy fixes.
This integration will likely grow in features, eg creating spans (performance monitoring) automatically for every fragment

[wzieba]

nicely done, thanks a lot, left a few comments only the Java or Kotlin would be a question to be answered, all the rest are easy fixes.

@marandaneto thank you a lot for the review!

I'm now fixing formatting issues - I couldn't reproduce them locally as I was using Java 11.0 on my machine. After changing JDK to 1.8 (the same as on CI) I was able to reproduce&fix them.

This integration will likely grow in features, eg creating spans (performance monitoring) automatically for every fragment

Sure, that's a good idea to add spans for this integration too.

[codecov-commenter]

Codecov Report

Merging #1522 (9910d77) into main (97c6a66) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #1522   +/-   ##
=========================================
  Coverage     76.12%   76.12%           
  Complexity     1934     1934           
=========================================
  Files           191      191           
  Lines          6696     6696           
  Branches        666      666           
=========================================
  Hits           5097     5097           
  Misses         1274     1274           
  Partials        325      325           

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[bruno-garcia]

wow this is beautiful stuff. Thanks @wzieba

[marandaneto]

@wzieba good stuff, thanks a lot, also pretty nice the comments linking the commit hash, so easy to review, nicely done.
left 2 small comments, other than that LGTM.
I
l'll cut a release early next week :)

[wzieba]

Thank you @marandaneto , it was a pleasure working on this. I've left one comment about parameterless constructor - please take a look and let me know if it needs changes.

l'll cut a release early next week :)

Great, thanks!