Add internal package to libnavigator and libtrip-notification

[Guardiola31337]

Description

This PR adds internal package to libnavigator and libtrip-notification

Splitting #2417 in different PRs

Refs. #2811 #2820

As this is going to be a big refactor the plan here is to open small PRs and move stuff incrementally making the review easier. Even trying to do so this first PR included changes in 35 files (mostly moving files around)

• I have added any issue links
• I have added all related labels (bug, feature, new API(s), SEMVER, etc.)
• I have added the appropriate milestone and project boards

Goal

The goal here is to add internal package to 1.0 modules and the APIs designed only for local usage

Implementation

• Move classes around to internal package
• Add internal modifier
• Fix package across codebase

Testing

• I have tested locally (including SNAPSHOT upstream dependencies if needed) through testapp/demo app and run all activities to avoid regressions
• I have tested via a test drive, or a simulation/mock location app
• New and existing unit tests pass locally with my changes

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have updated the CHANGELOG including this PR

[codecov-io]

Codecov Report

Merging #2836 into master will decrease coverage by 0.01%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master    #2836      +/-   ##
============================================
- Coverage     35.03%   35.01%   -0.02%     
  Complexity     2107     2107              
============================================
  Files           541      541              
  Lines         19409    19409              
  Branches       1836     1836              
============================================
- Hits           6799     6796       -3     
- Misses        11796    11798       +2     
- Partials        814      815       +1