Allow area, device, and entity selectors to optionally support multiple selections like target selector

[r-t-s]

Proposed change

Changes to the Area, Device, and Entity selectors to allow them to select multiple entities.
The user interface is similar to the Area, Device and Entity selector component of the target selector.
Single or multi select is configured with the optional multiple option on the selector configuration.
The selectors can now potentially return a list of area, device, or entity IDs.

This is motivated by the need to have multiple entity selector so a blueprint can trigger on multiple entities.
But brings a consistent UI for the Area, Device, Entity, and Target selector.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logo's and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: #62138 #11059
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue:

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[frenck]

✅ Approved. Can be merged as soon as the parent PR gets merged.

[r-t-s]

Sorry I had to amend the previous commit. I received the following error when I tried to add a new commit:
! [remote rejected] entity_selector -> entity_selector (refusing to allow a Personal Access Token to create or update workflow .github/workflows/test.yml without workflow scope)

[frenck]

Thanks, @r-t-s 👍