Transform TextInput to es6 class

[mkslanc]

Issue #, if available:

Description of changes:

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Pull Request Checklist:

• No backwards incompatible changes were made to Ace's public interface which is defined through the main typings file (ace.d.ts) and its references:
  • https://github.com/ajaxorg/ace/blob/master/ace.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-modes.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-extensions.d.ts

[github-actions]

One of the public type files has been updated, plase make sure there are no backwards incompatible changes done in the PR.

[github-actions]

One of the public type files has been updated, plase make sure there are no backwards incompatible changes done in the PR.

[codecov]

Codecov Report

Attention: Patch coverage is 74.77477% with 112 lines in your changes missing coverage. Please review.

Project coverage is 87.48%. Comparing base (63add65) to head (8c4ad07).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/keyboard/textinput.js	74.77%	112 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5805      +/-   ##
==========================================
+ Coverage   87.45%   87.48%   +0.02%     
==========================================
  Files         611      611              
  Lines       45669    45616      -53     
  Branches     7498     7485      -13     
==========================================
- Hits        39938    39905      -33     
+ Misses       5731     5711      -20     

Flag	Coverage Δ
unittests	87.48% <74.77%> (+0.02%)	⬆️

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