Add Bookmarks to FE

Bookmarks API from Glitch-Soc Mastodon fork is already in the BE

We should expose this to users in the FE. This is a feature like favorites but they are private.

https://glitch-soc.github.io/docs/features/bookmarks/

assigned to @jaredr

mentioned in merge request !752 (closed)

mentioned in issue pleroma#807 (closed)

added mastoapi label

assigned to @feld and unassigned @jaredr

added Code Review label

assigned to @eugenijm and unassigned @feld

mentioned in issue #504 (closed)

mentioned in merge request !903 (merged)

closed via merge request !903 (merged)

mentioned in commit 76de4a31

unassigned @eugenijm