Introduce select UI component

[mlewand]

📝 Provide a description of the new feature

We need a view class for a select component.

This feature is required for #1110, see #1110 (comment).

Example implementation

There's a pull request that was adding this component #530, but we didn't merge it see #5770 (comment) for rationale.

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[jodator]

How it's different from a dropdown button with a text like the one used for headings (besides of styling)?

[oleq]

See ckeditor/ckeditor5-ui#530 (comment).

[mlewand]

The component was initially used for special characters, but we decided to move away to dropdown.

As such there's no longer a need for select component, so we decided not to merge #530 as of now.

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[CKEditorBot]

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