Let feeds_log render with the Admin theme, please?

Problem/Motivation

Desire to leverage the new-ish `feeds_log` module, tho enabling it and then going to review the resulting logs feels disjointed since the logs tab/page uses the site's theme, and not the administration theme. I guess it is because the feed itself is treated as content, but it really only makes sense to users of the system I'm maintaining that the resulting imported items be treated as content, and the feed itself, including results of `feeds_log`, fall on the admin side.

Steps to reproduce

Just enable `feeds_log`, run an import, and then navigate to review the import's logs

Proposed resolution

I think `/feeds/{id}/log` is befitting of using the admin theme, or at least honoring the appearance switch to utilize the admin theme when editing content, just like `/feeds/{id}/edit`. Incidentally, I think `/feeds/{id}/list` to also gain this appearance behavior/capability.

Remaining tasks

Am I crazy?

User interface changes

As in Proposed resolution, implement a theme switch for `feeds/{id}/log` route (and ideally also for `/feeds/{id}/list` route).

API changes

None, N/A

Data model changes

None, N/A