Add basic(ms-basic) highlight mode

[mkslanc]

Issue #, if available: #5550

Description of changes:
Add token highlighting and folding for basic language. MS-BASIC was taken as basis, because seems it was the most popular one in times

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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

[whazor]

Old school

[nightwing]

@whazor should we disable error Unexpected trailing comma comma-dangle eslint rule? we had added it for old IE, but new browsers all support trailing commas.

[whazor]

We don't need to support old IE anymore. However, it would be ironic to disable old IE support in order to support an even older Microsoft technology.

[akoreman]

Could you also add the new modes to ace-modes.d.ts to resolve the failing build

[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 88.59060% with 17 lines in your changes missing coverage. Please review.

Project coverage is 87.01%. Comparing base (b168a97) to head (a511312).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/mode/basic.js	57.69%	11 Missing ⚠️
src/mode/folding/basic.js	93.05%	5 Missing ⚠️
src/mode/folding/basic_test.js	97.67%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #5649    +/-   ##
========================================
  Coverage   87.00%   87.01%            
========================================
  Files         594      598     +4     
  Lines       43516    43665   +149     
  Branches     7174     7205    +31     
========================================
+ Hits        37862    37994   +132     
- Misses       5654     5671    +17     

Flag	Coverage Δ
unittests	87.01% <88.59%> (+<0.01%)	⬆️

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