feat: add in-app event listener

[levibostian]

QA:

• Install pr.57 builds for testing
• To test that the event listeners are working, you will use Remote Habits logs (not SDK logs). If you see log statements such as "in-app message shown. message ...." then the event listener received an event successfully.
• You should see log messages for the following events (you will need to make these events happen in the app for in-app messages):
  • message shown
  • message dismissed
  • message error happened (maybe you can't test this?)
  • message action taken

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[ami-oss-ci]

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[mrehan27]

For newer commits. builds were not initiated for some reason, so closing this and created new PR #61 for same changes.