fix: RTD needs an __init__.py in fgpyo/platform/

[emmcauley]

Adds an __init__.py in fgpyo/platform/ and ensures docstrings play nice with RTD.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.11%. Comparing base (c7e1322) to head (0f394b6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #174      +/-   ##
==========================================
- Coverage   89.14%   89.11%   -0.03%     
==========================================
  Files          17       18       +1     
  Lines        2026     2068      +42     
  Branches      446      457      +11     
==========================================
+ Hits         1806     1843      +37     
- Misses        144      147       +3     
- Partials       76       78       +2     

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