Add "enableDoubleFindToReplace" option

[nunziotocci]

Issue #, if available:
Brings back the behavior that #2653 complained about behind an option.

Description of changes:
Add "enableDoubleFindToReplace" option. This allows you to press Ctrl-F while the find window is open to toggle the replace option. I'm used to it, and so are the people at my company.

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

[InspiredGuy]

Thank you for the contribution. Could you please add the new option to the types declaration in ace.d.ts, add a test for the new option, and expose the option in the kitchen sink? Please refer to #5233 as an example for those

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.42%. Comparing base (7a6b83e) to head (06a294f).
⚠️ Report is 423 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5346      +/-   ##
==========================================
+ Coverage   87.41%   87.42%   +0.01%     
==========================================
  Files         574      574              
  Lines       45613    45613              
  Branches     6935     6935              
==========================================
+ Hits        39873    39878       +5     
+ Misses       5740     5735       -5     

Flag	Coverage Δ
unittests	87.42% <ø> (+0.01%)	⬆️

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[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.

[nunziotocci]

I have added it to ace.d.ts via ace-internal.d.ts and npm run update-types. I also added it to the Kitchen Sink.

I don't see any tests for ext/searchbox. How might I go about adding one?