Adds a request_token_inhibit_errors configuration flag (disabled by
default) which, if enabled, change the behaviour of all /requestToken
endpoints so that they return a 200 and a fake sid if the 3PID was/was
not found associated with an account (depending on the endpoint),
instead of an error.

Co-Authored-By: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>

It was originally implemented by pulling the full auth chain of all
state sets out of the database and doing set comparison. However, that
can take a lot work if the state and auth chains are large.

Instead, lets try and fetch the auth chains at the same time and
calculate the difference on the fly, allowing us to bail early if all
the auth chains converge. Assuming that the auth chains do converge more
often than not, this should improve performance. Hopefully.

Extends #5794 etc to the SimpleHttpClient so that it also applies to non-federation requests.

Fixes #7092.

This reverts commit 54dd2862, reversing
changes made to 6640460d.

* Break down monthly active users by appservice_id and emit via prometheus.

Co-authored-by: Brendan Abolivier <babolivier@matrix.org>

This is a precursor to giving EventBase objects the knowledge of which room version they belong to.

Fix #6910

Fix #6910 

to stop the federationhandler trying to do master stuff

When we get an invite over federation, store the room version in the rooms table.

The general idea here is that, when we pull the invite out again, we'll want to know what room_version it belongs to (so that we can later redact it if need be). So we need to store it somewhere...

Ensure 'deactivated' parameter is a boolean on user admin API, Fix error handling of call to deactivate user (#6990)

Ensure good comprehension hygiene using flake8-comprehensions.

The state res v2 algorithm only cares about the difference between auth
chains, so we can pass in the known common state to the `get_auth_chain`
storage function so that it can ignore those events.

it's not in the spec yet, so needs to be unstable. Also add a feature flag for it. Also add a test for admin users.

As per
https://github.com/matrix-org/matrix-doc/pull/2432#pullrequestreview-360566830,
make room alias lists accessible to users outside world_readable rooms.

these were getting a bit unwieldy, so let's combine `check_joined_room` and
`check_user_was_in_room` into a single `check_user_in_room`.

per matrix-org/matrix-doc#2432

Stop sending events when creating or deleting associations (room aliases). Send an updated canonical alias event if one of the alt_aliases is deleted.

this amounts to the same thing, but replaces `_event_dict` with `_dict`, and
removes some of the function layers generated by `property`.

Convert directory handler tests to use HomeserverTestCase.

Add a method to the spam checker to filter the user directory results.

* Reject device display names that are too long.

Too long is currently defined as 100 characters in length.

* Add a regression test for rejecting a too long device display name.

... and use it in places where it's trivial to do so.

This will make it easier to pass room versions into the FrozenEvent
constructors.