Add contentTypeEditor to editorService

[bjarnef]

Prerequisites

• I have added steps to test this contribution in the description below

Description

Follow-up on #15017 to make it a bit simple to open content type editor and reduce some of the same logic based on content type.

I think it could also be useful to (package) developers.

Relates to #15080

[github-actions]

Hi there @bjarnef, thank you for this contribution! 👍

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[mikecp]

Hi @bjarnef ,

Thanks for your PR! A member of the Core Collaborators team will have a look at it soon!

[bjarnef]

Default to documentType to keep it consistent with: #15080

[nul800sebastiaan]

Good stuff @bjarnef - thanks very much! 👍