Show entity source

[balloob]

The request

With home-assistant/core#37258 we get access to be able to query the source of an entity. This can be helpful to see if it's coming from configuration.yaml or a config entry, even if it has no unique ID.

We should make this visible to the user.

The alternatives

Additional information

[balloob]

The backend PR is ready. Not merged yet in case we need some changes based on frontend work.

[github-actions[bot]]

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This issue has now been marked as stale and will be closed if no further activity occurs. Thank you for your contributions.

[balloob]

We should still add this.

[bramkragten]

I want to assign this to me, but then I have to move it back to an issue again 😄