feat(redshift): adds classic or elastic resize type option

[daschaa]

Fixes #19430.

Adds the property classicResizing property to the ClusterProps. If not set or set to false, elastic resizing is used.

I feel like an entry in the README is not necessary. If it is ok, please add pr-linter/exempt-readme label to this PR.

---

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[gitpod-io]

[corymhall]

When would a user want to use classic vs elastic? Without doing some research myself I am not sure. Can you add more information to this docstring to help the user make that decision? Depending on how complicated the answer it it might need a README update.

Pull request has been modified.

[daschaa]

@corymhall I have added more information to the docstring. I hope it is ok like this :)
Do you think it is worth adding a README section?
I think it could be useful, because the topic is quite complex. Or is it enough to link the official AWS docs there?

[corymhall]

@corymhall I have added more information to the docstring. I hope it is ok like this :)
Do you think it is worth adding a README section?
I think it could be useful, because the topic is quite complex. Or is it enough to link the official AWS docs there?

Thanks for making the update! I think this is much better! I think for the scope of this PR this is fine, but I'll add a backlog item to add a resizing section to the README since it looks like resizing is pretty complicated.

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).