Ensure we don't mutate the cache of push rules

Add pagination support to publicRooms

Ensure we don't mutate state cache entries

Split out public room list into a worker process

make device IDs more useful for human disambiguation

Fix typo "persiting"

Limit how often we ask for keys from dead servers

Move the E2E key handling into the e2e handler

Add a timeout parameter for end2end key queries.

Add WHERE clause support to index creation

Add a timeout parameter for controlling how long synapse will wait
for responses from remote servers. For servers that fail include how
they failed to make it easier to debug.

Fetch keys from different servers in parallel rather than in series.

Set the default timeout to 10s.

Add is_direct param to /createRoom