Abstract proguard rules at package level

[LuisDuarte1]

After some investigation on #1242, I've concluded that:

• javax.annotations has annotations included in the JSR305, which is a spec of annotations that help with IDEs or other tools to avoid software defects.
• com.google.errorprone has annotations related to ErrorProne, a static analyzer with its own set of annotations like above.

These annotations are not reflected at runtime in any shape or form so, it's safe to ignore them (unfortunately, libs cannot specify what to ignore or not on proguard, so we need to do this by hand).

This PR groups the two annotation packages.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 17%. Comparing base (3ab886a) to head (79694ec).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1247 +/- ## ======================================= + Coverage 17% 17% +1% ======================================= Files 229 229 Lines 6965 6965 ======================================= + Hits 1149 1156 +7 + Misses 5816 5809 -7 ```