Implement used_input? instead of phx-feedback-for

[mitkins]

Moves Petal Components away from phx-feedback-for and phx-no-feedback

Also merges the contents from this PR - #341. Thanks @joepstender.

[codecov]

Codecov Report

Attention: Patch coverage is 98.23789% with 4 lines in your changes missing coverage. Please review.

Project coverage is 89.57%. Comparing base (2778d68) to head (de0e34b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/petal_components/input.ex	0.00%	2 Missing ⚠️
lib/petal_components/form.ex	99.14%	1 Missing ⚠️
lib/petal_components/icons/svg.ex	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #382      +/-   ##
==========================================
- Coverage   89.77%   89.57%   -0.21%     
==========================================
  Files          37       37              
  Lines        1634     1582      -52     
==========================================
- Hits         1467     1417      -50     
+ Misses        167      165       -2     

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