Caches work incorrectly: additionalEditorconfig should be @Input instead of @Internal

[m-burst]

Steps to reproduce:

1. Write some code with ktlint violations
2. Run ktlint via plugin with enabled build cache
3. Disable the violated rule using additionalEditorconfig
4. Run ktlint again with enabled build cache

Expected behaviour: ktlint will be re-run with updated editorconfig and will not report the violations

Actual behaviour: ktlint will use the cached result

As far as I understand, the cause of this is that BaseKtLintCheckTask.additionalEditorconfig is not checked when computing cache keys for the task because it is marked as @Internal, and should be @Input instead.

Unless there are any reasons for this property being @Internal, I would gladly submit a PR changing it to @Input.

[wakingrufus]

I would love a PR for this. There should be some tests already that are fairly similar you can copy from to get started on your test. Let me know if you get stuck and I can assist.

[m-burst]

I finally got around to this and opened #758. Could you please take a look?

[m-burst]

Thanks for reviewing and merging!
Do you have any plans to cut a release sometime soon?