MediaLibrary: Add a way to fetch a bookmark by its id

3 jobs for master in 22 minutes and 9 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #527640
amd64 docker
asan-ubsan

00:22:09

passed #527637
amd64 docker
coverage

00:05:17

87.1%
passed #527641
amd64 docker
tsan

00:14:32