Split out user directory to a separate process

Include users who you share a room with in user directory

allow Authorization header

Signed-off-by: Matthias Kesler <krombel@krombel.de>

Fix phone home stats

Fix user directory insertion due to missing room_id

Fix user dir to not assume existence of user

Add cache for is_host_joined

Tweak the ranking of PG user dir search

Don't assume existence of events when updating user directory

Throw exception when not retrying when downloading media

Change is_host_joined to use current_state table

Cache state deltas

Fix has_any_entity_changed

Fix removing of pushers when using workers

Mark remote invite rejections as outliers