bottom sheet with text input style option enabled

[rohitbhoite]

📜 Description

Added option to enable users to provide custom text input styles.

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7bde416) 83.70% compared to head (34f013a) 83.72%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #248      +/-   ##
==========================================
+ Coverage   83.70%   83.72%   +0.02%     
==========================================
  Files          20       20              
  Lines         632      633       +1     
==========================================
+ Hits          529      530       +1     
  Misses        103      103              

Files	Coverage Δ
...back/lib/src/feedback_builder/string_feedback.dart	100.00% <100.00%> (ø)
feedback/lib/src/theme/feedback_theme.dart	86.36% <ø> (ø)

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[ueman]

Thanks!