Added InAppMessaging for iOS and Android

[ianitsky]

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Documentation changes
• Other... Please describe:

PR Checklist

For bug fixes / features, please check if your PR fulfills the following requirements:

• Testing has been carried out for the changes have been added
• Regression testing has been carried out for existing functionality
• Docs have been added / updated

What is the purpose of this PR?

Add firebase InAppMessaging as described in he link:
https://firebase.google.com/docs/in-app-messaging/get-started?platform=android

Does this PR introduce a breaking change?

• Yes
• No

What testing has been done on the changes in the PR?

Functional testing, using emulators and real devices

What testing has been done on existing functionality?

Using emulators and real devices

Other information

[ghost]

Congratulations 🍻. DeepCode analyzed your code in 0.106 seconds and we found no issues. Enjoy a moment of no bugs ☀️.

💬 This comment has been generated by the DeepCode bot, installed by the owner of the repository. The DeepCode bot protects your repository by detecting and commenting on security vulnerabilities or other critical issues.

---

☺️ If you want to provide feedback on our bot, here is how to contact us.

[dpa99c]

Thanks for this. I will probably merge this into the dev branch in which I'm currently implementing the Firestore API and it can go out in the same release.