Implement TextArea.resizable

[philippjfr]

Does not yet correctly handle horizontal/width resizing.

Partially fixes #427

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.70%. Comparing base (570dfe7) to head (89a3b06).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #436      +/-   ##
==========================================
+ Coverage   78.69%   78.70%   +0.01%     
==========================================
  Files          31       31              
  Lines        2863     2865       +2     
==========================================
+ Hits         2253     2255       +2     
  Misses        610      610              

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