Generate create menu items

Merged the MR! It's good enough for now. We'll have to still update the code to get rid of the hard coded entity types so that it doesn't break if you don't have some of the modules enabled.

Got feedback from @ckrina that we should not introduce the submenus to the "Create" menu, and that we should implement a solution that displays a filtered list of options but on a single level.

Agreed, we need to have the conversation about having an special UI to handle this. I'd be great to get a first draft of the "what" defined at DrupalCon.

Anyway, for solving this specific issue for now I'd go with 2 tickets so we can ask to people what they see more useful:

Option 1, merged to keep a closer result of what we have right now:

1. Implement your solution for nodes
2. Let'snot add blocks yet
3. Implement the media links manually: just Images and Files for now
4. Implement the tags with the same solution you proposed for nodes
5. Keep current implementation for users

Option 2, open a MR with the existing proposal in this MR. But maybe without blocks?

Thoughts?

Reviewed the work done in Gin and used a bit of the code to verify content types, block types, term vocabularies, and if media is enabled, media items. Fun fact, Image and Files are media entities, so if the module isn't enabled, it won't have an add path. I wanted to capture the logic in this branch with a commit before removing blocks, media and taxonomy, but also would like y'all to look at the result and see if maybe it becomes acceptable.

Forgot our fancy tag..

Thanks @markie! What @saschaeggi meant in comment #13 is that we want to remove the submenu and groupings from the Create item, so we have a list without anything opening a submenu. So it would look like:

• Recipie (if Node is enabled)
• Article (if Node is enabled)
• Basic Page (if Node is enabled)
• Image (if Media module is installed)
• File (if Media module is installed)
• User

Updated listing and verified that if media exists, the proper items are shown. I feel that we should list all media entity types but that's up to y'all.

Thanks for moving this forward!

The content menu should end up being (at least for now):

• Create
  • Article
  • Basic Page
  • Recipe (if Umami)
  • Image (if Media module is installed)
  • File (if Media module is installed) <-- Missing
  • User
• Content
• Files
• Media<-- Missing

The File in the Content creation item is missing, and also the link to Media. So moving this to NW.

This is also removing the Blocks. I don't think it's a big deal for now, but we'll need to validate that in follow-ups.

I would like to reiterate that there is no `/file/add` or anything so the closest thing we have is the "Document" media entity type. I realize the one I added was removed at Sascha's request. Would you like that named "File" instead of "Document"?

Agh, that’s right that it’s called Document. So yeah, I’d use Document instead of File for now (and let’s figure out later the best default, but at least we can test now and get some feedback).
Thanks!

Merging this so we can start working on top of it. Thanks all!