fix(ui, core): make message input regex caseInsensitive.

[xsahil03x]

Fixes: #1548

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (ee9d35b) 58.49% compared to head (a62ebcf) 58.48%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1550      +/-   ##
===========================================
- Coverage    58.49%   58.48%   -0.01%     
===========================================
  Files          290      290              
  Lines        17654    17655       +1     
===========================================
  Hits         10326    10326              
- Misses        7328     7329       +1     

Impacted Files	Coverage Δ
...er/lib/src/message_input/stream_message_input.dart	35.32% <ø> (ø)
...er_core/lib/src/message_text_field_controller.dart	0.00% <0.00%> (ø)

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