Just to have all the methods that make calls to identity services in one place.

Add some helpful opentracing tags and remove get_user_by_req span

Doing a password reset via SMS has never worked, and in any case is a silly
idea because msisdn recycling is a thing.

See also matrix-org/matrix-doc#2303.

Fixes #5905

Prune old rows in user_ips tables.

Move last seen info into devices table

Enable cleaning up extremities with dummy events by default to prevent undue build up of forward extremities. (#5884)

Co-Authored-By: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

Fixes #6103

If email or msisdn verification aren't supported, let's stop advertising them
for registration.

Fixes #6100.

This will make it easier to search for sending event requests.

Pull the checkers out to their own classes, rather than having them lost in a
massive 1000-line class which does everything.

This is also preparation for some more intelligent advertising of flows, as per #6100

We don't actually care about what happens in `get_user_by_req` and
having it as a separate span means that the entity tag isn't added to
the servlet spans, making it harder to search.

because, frankly, it looked like it was written by an axe-murderer.

This should be a non-functional change, except that where `m.login.dummy` was
previously advertised *before* `m.login.terms`, it will now be advertised
afterwards. AFAICT that should have no effect, and will be more consistent with
the flows that involve passing a 3pid.

Fix the return value in the users_set_deactivated_flag background job

Update the process for mapping SAML2 users to matrix IDs

Added in #5377, apparently in error