Add ClearButton to TextField

[kitsuyui]

Implement only the function without setting CSS etc.

[codecov-commenter]

Codecov Report

Attention: 51 lines in your changes are missing coverage. Please review.

Comparison is base (99dca13) 62.73% compared to head (9db4c23) 68.85%.
Report is 78 commits behind head on main.

Files	Patch %	Lines
packages/treemap/src/treemap.tsx	0.00%	18 Missing ⚠️
packages/textfield/src/TextArea.tsx	77.55%	11 Missing ⚠️
packages/textfield/src/TextField.tsx	77.08%	11 Missing ⚠️
packages/editablelabel/src/EditableLabel.tsx	91.66%	4 Missing ⚠️
packages/textfield/src/ClearButtonProvider.tsx	93.22%	4 Missing ⚠️
packages/dekamoji/src/dekamoji.tsx	85.71%	2 Missing ⚠️
packages/style-bulma/src/timer.tsx	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #279      +/-   ##
==========================================
+ Coverage   62.73%   68.85%   +6.12%     
==========================================
  Files          30       35       +5     
  Lines        1119     1249     +130     
  Branches      201      218      +17     
==========================================
+ Hits          702      860     +158     
+ Misses        417      389      -28     

Flag	Coverage Δ
unittests	68.85% <79.43%> (+6.12%)	⬆️

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