Release APK Minification Optimisation - Update Keep Rules to Shrink APK Further

[qiarie]

This issue is blocked by issue #3637 - Setup Sentry Authentication for CI/CD for Minified Release APKs.

Incrementally update ProGuard keep rules to further reduce APK size without interfering with app functions.

There is extensive use of wildcard keep rules. With wildcard rules, everything inside the path is retained. This is not optimal and was done as a first iteration to activate shrinking while having the app function as expected.

This requires replacing wildcard keep rules with specific classes and class members while running tests to ensure the app functions properly.