CustomElementFormatter plugin type for entity_ce_display

diff link to unmerged related issue
https://git.drupalcode.org/issue/custom_elements-3362625/-/compare/33596...

ok, this one needs some more work and possibly discussion. I've added my remarks to the WIP code.
@junkuncz Please take a look and then let's discuss!

roderik → changed the visibility of the branch 3362625-customelementformatter-plugin-type to hidden.

roderik → changed the visibility of the branch 3362625-customelementformatter-plugin-type to hidden.

junkuncz → changed the visibility of the branch 3362625-customelementformatter-plugin-type to active.

junkuncz → changed the visibility of the branch new-ce-formatter to hidden.

junkuncz → changed the visibility of the branch 3.x to hidden.

junkuncz → changed the visibility of the branch 8.x-2.x to hidden.

junkuncz → changed the visibility of the branch 3359601-re-implement-with-new-concept to hidden.

First step:
* Ship with auto and raw formatters

Follow-ups we need:
* Add support for field formatters
* Add UI for configuring CE-formatters
* Fix support for entity-prepare view step

New MR for cleanup.

I have a question about enabled/disabled CE displays (in the comments).

Setting back to Needs Work because of questions I have, that I'd probably like to address first -- and outside this issue queue is likely faster.

..And then all the answers to the questions I had, seeped into my head overnight.

This is now changed, documented and for review again. I removed many of the earlier comments and questions I had earlier, from the MR. So only relevant comments are on there now.

@roderik

thanks, merged the tests-PR. This ticket got long and massive, let's add sub-tasks/issues for remaining/next steps?
I've left some non-blocking comments above, let's move any action items in sub-tasks/follow-up also, like one for the update path.

Setting to needs work for that, but when all follow-up/sub-tasks are added I think we can close this first one.

Followup(s):

created 🐛 Update path and documentation Active

modified 📌 Fix editing UI for CE displays / make default display disable-able Active to be about the UI

There are some comments in the MR to be addressed, but that's clearly noted in the followup(s), so indeed, we can close this.

(Also updated the list in 🌱 [META] custom_elements_ui: 3.x alpha release Active

Automatically closed - issue fixed for 2 weeks with no activity.