Add swipedown exit fullscreen feature

[Ortes]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.71%. Comparing base (d228479) to head (a4d847b).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/src/chewie_player.dart	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #930      +/-   ##
==========================================
- Coverage   43.84%   43.71%   -0.14%     
==========================================
  Files          21       21              
  Lines        1601     1606       +5     
==========================================
  Hits          702      702              
- Misses        899      904       +5     

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[diegotori]

Two things:

1. You need to make this configurable from the ChewieConttoller. In other words, you need to make this opt-in.
2. When making this configurable, you also need to make the threshold dismissing on swipe a configurable value, defaulting to a reasonable value.