feat: add platform-api module (fix #287)

[joshuasing]

Summary
Move Platform API into a separate module (platform-api)
Resolves #287

Changes

• Add platform-api module
• Move PlatformChameleon into platform-api module
• Add dependance on platform-api to all platforms
• Remove PlatformChameleon from api unit tests

Checklist

• I acknowledge and agree to the terms of the Developer Certificate of Origin.
• All contributed code can be distributed under the terms of the MIT License.
• I have read the contributing guidelines and code of conduct.
• I have checked the "Allow edit from maintainers" option.
• I have added appropriate unit tests for my changes.

[codecov]

Codecov Report

Merging #288 (fcf09d7) into main (57e9b80) will decrease coverage by 0.08%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #288      +/-   ##
============================================
- Coverage     70.92%   70.85%   -0.08%     
+ Complexity      407      405       -2     
============================================
  Files            73       72       -1     
  Lines          1517     1513       -4     
  Branches         87       87              
============================================
- Hits           1076     1072       -4     
  Misses          407      407              
  Partials         34       34              

see 1 file with indirect coverage changes