Allow admins to flag bot accounts

https://docs-develop.pleroma.social/backend/API/admin_api/#patch-apipleromaadminusersnicknamecredentials

We can currently set actor_type and on a user, but not bot field. There are two ways we can control this, and we should allow both for now. These are the action items:

Allow setting bot field via Admin API. This is boolean. Requires BE implementation pleroma#1792 (closed)
Allow setting actor_type field via Admin API. This should be a dropdown list in AdminFE only permitting the values Service, Person. Technically we can support freeform text here, but we won't expose that in AdminFE.

Perhaps we should put bot and actor_type here?

And then we can add more functionality in this area like letting the Admin control tags and roles as well?

Edited Aug 19, 2020 by Angelina Filippova

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