refactor: make a lot of data models internal that don't need to be public.

[autonomousapps]

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[github-actions]

❌ Test workflow failed:

* Root buildHealth         : https://gradle.com/s/m2kd5cuzxd67i
* TestKit buildHealth      : 
* Non-functional tests     : 
* TestKit check            : 
* JVM functional tests     : 
* Android functional tests : 

[github-actions]

❌ Test workflow failed:

* Root buildHealth         : https://gradle.com/s/6ozuoro43mymw
* TestKit buildHealth      : https://gradle.com/s/4vvn4m66ztd3o
* Non-functional tests     : https://gradle.com/s/d5qdxqxdydija
* TestKit check            : https://gradle.com/s/tucnoq677l766
* JVM functional tests     : https://gradle.com/s/hsfmffqcmza7k
* Android functional tests : https://gradle.com/s/6ujebvjal7mgq