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?