add new error type ResourceLimit

Merge branch 'neilj/limit_exceeded_error' of github.com:matrix-org/synapse into neilj/limit_exceeded_error

Neilj/resource limit block event creation

Update the admin register documentation to return a real user ID

Presumably this is the intention anyways. I've also updated the domain part to be something more along the lines of what people might expect.

Fix inbound federation on reader worker

Inbound federation requires calculating push, which in turn relies on
having access to account data.

Changelog should link to PRs

Fix Mau off by one errors

These were removed for the 0.33.2 release, but were incorrectly re-added in

Move more federation APIs to workers

support admin_email config and pass through into blocking errors, 

This involves renaming _persist_events to be a public function.

Merge branch 'neilj/update_limits_error_codes' of github.com:matrix-org/synapse into neilj/admin_email

combine mau metrics into one group

Don't fail requests to unbind 3pids for non supporting ID servers