Block Editor: Alphabetize block editor components exports

[aduth]

Extracted from #15194

This pull request seeks to correct inconsistent alphabetization of exported entries from the packages/block-editor/src/components/index.js file.

Testing instructions:

The included changes are simply a reordering. There should be no impact on the behavior of the application. Verify that this is true.

[ellatrix]

Would it make sense to create a rule to force alphabetisation of all imports and exports?

[aduth]

Would it make sense to create a rule to force alphabetisation of all imports and exports?

For myself, I don't feel strongly about alphabetization for most import usage in any other file. For these "mega" files, however, I think they can serve as references where a lack of alphabetization can be more detrimental. To that end, I think a rule could help, but it would be of limited benefit, and even for how I'd done the alphabetization here, I had a hard time considering how to deal with cases where multiple exports are declared in the same statement (e.g. RichTextToolbarButton, UnstableRichTextInputEvent).