FlagChatAdapter Updates.

[IODevBlue]

Hello!

I am currently using this adapter in an application and I'd like to contribute minor changes I made to the FlagChatAdapter code.

Here's a summary:

• Upgraded the project to Gradle 7.4.2
• Changed compileSdkVersion from 27 to 32
• Migrated project to use androidx
• Replaced Kotlin synthetics with regular findViewById()
• Improved KDoc comments.