Enhance textarea tv type

[smg6511]

What does it do?

Adds new input options to control input height.

Why is it needed?

Currently this input type is restricted to its default size of 140px.

How to test

1. Rebuild the manager template (cd to _build/templates/default and run grunt build)
2. Clear MODX caches
3. Create a few textarea type TVs to test the three new options (height, auto grow, and resize)

Related issue(s)/PR(s)

Resolves #5512

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 21.55%. Comparing base (1b01af2) to head (1512af8).
Report is 3 commits behind head on 3.x.

Files	Patch %	Lines
...mplateVar/Configs/mgr/inputproperties/textarea.php	0.00%	29 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.x   #16553      +/-   ##
============================================
- Coverage     21.57%   21.55%   -0.02%     
  Complexity    10577    10577              
============================================
  Files           561      561              
  Lines         31975    32003      +28     
============================================
  Hits           6898     6898              
- Misses        25077    25105      +28     

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