Fix intermediate way point arrival not triggered

[danesfeder]

Description

Fixes #1904

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

Goal

Arrival state and listeners should be triggered for each way point along the route, not just the last one.

Implementation

Add a "previous" NavigationStatus to the processor that allows us to look at the route state only after it's been passed to the developer in a listener.

Screenshots or Gifs

Modified NavigationLauncherActivity to allow way points for the passed DirectionsRoute:

Testing

Please describe the manual tests that you ran to verify your changes

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• I have tested via a test drive, or a simulation/mock location app
• I have added tests that prove my fix is effective or that my feature works
• 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

[codecov-io]

Codecov Report

Merging #1908 into master will increase coverage by 0.89%.
The diff coverage is 90.9%.

@@             Coverage Diff              @@
##             master    #1908      +/-   ##
============================================
+ Coverage     35.04%   35.94%   +0.89%     
- Complexity     1060     1076      +16     
============================================
  Files           261      261              
  Lines          8848     8853       +5     
  Branches        667      667              
============================================
+ Hits           3101     3182      +81     
+ Misses         5475     5383      -92     
- Partials        272      288      +16

[Guardiola31337]

Looks good to me 🚢 🚢 @danesfeder and thanks!