Move resize CSS into its own library

This is within the threshold of asset sizes in performance tests because it's a small file, meaning tests don't fail due to the improvemnet, but it allows us to lower those threshold a little bit, so have done that.

So I tested this one on a standard install of 11.x
Went to the add Article node form
Using the browser changed size left and right, up and down and everything resized just fine.

Leaving the tag if there is additional testing that should be done, else LGTM

@smustgrave did you resize the browser window or the textarea? The ckeditor textarea isn't resizable (at least not out of the box), however the revision information box should be vertically resizable.

I resized the browser window

OK that's not affected by this, only affects textareas (the draggable corner, when it's there).

Ah thanks. Took your advice from slack and used the revision log area to test and can confirm I can still drag the textarea up and down

The Needs Review Queue Bot → tested this issue. It no longer applies to Drupal core. Therefore, this issue status is now "Needs work".

This does not mean that the patch necessarily needs to be re-rolled or the MR rebased. Read the Issue Summary, the issue tags and the latest discussion here to determine what needs to be done.

Consult the Drupal Contributor Guide → to find step-by-step guides for working with issues.

Clean rebase, back to RTBC.

couple of things

textarea-resize makes sense, and removed the stray dump.

Feedback appears to be addressed.

The Needs Review Queue Bot → tested this issue. It no longer applies to Drupal core. Therefore, this issue status is now "Needs work".

This does not mean that the patch necessarily needs to be re-rolled or the MR rebased. Read the Issue Summary, the issue tags and the latest discussion here to determine what needs to be done.

Consult the Drupal Contributor Guide → to find step-by-step guides for working with issues.

Straightforward rebase so restoring RTBC.

Small question left

nod_ → closed merge request !11439

Committed f6d07a1 and pushed to 11.x. Thanks!