fix: allow completers to trigger on newline characters

[andredcoliveira]

Issue #, if available:
N/A

Description of changes:
Completers may want to use newline characters for triggering suggestions. This is particularly useful when showing suggestions after typing prompts in the form of inline comments in the case of GenAI suggestions.

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.

[andredcoliveira]

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

Only a new method was added. No backwards incompatible changes

[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 72.00000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 86.56%. Comparing base (f493ab0) to head (a1ad3fe).

Files	Patch %	Lines
src/edit_session.js	0.00%	6 Missing ⚠️
src/autocomplete/util.js	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5519      +/-   ##
==========================================
- Coverage   86.57%   86.56%   -0.02%     
==========================================
  Files         588      588              
  Lines       42540    42553      +13     
  Branches     7068     7071       +3     
==========================================
+ Hits        36827    36834       +7     
- Misses       5713     5719       +6     

Flag	Coverage Δ
unittests	86.56% <72.00%> (-0.02%)	⬇️

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