feat: add on_key_event prop to TextInput

[ccbrown]

What It Does

Adds an on_key_event prop to TextInput. This provides a more elegant way to implement custom key binds or disable or override the default ones.

Going to let this PR marinate for a bit before merging.

Related Issues

#97

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.30%. Comparing base (fcbb0ee) to head (7e864d6).

Files with missing lines	Patch %	Lines
packages/iocraft/src/components/text_input.rs	58.33%	4 Missing and 1 partial ⚠️
packages/iocraft/src/handler.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
- Coverage   87.36%   87.30%   -0.06%     
==========================================
  Files          34       34              
  Lines        5358     5366       +8     
  Branches     5358     5366       +8     
==========================================
+ Hits         4681     4685       +4     
- Misses        568      572       +4     
  Partials      109      109              

Files with missing lines	Coverage Δ
packages/iocraft/src/handler.rs	90.32% <75.00%> (ø)
packages/iocraft/src/components/text_input.rs	68.45% <58.33%> (-0.37%)	⬇️

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