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Part of the Tchap mainlining.
This is in order to implement the new plan for user discovery. See matrix-org/synapse-dinsic#125 for the high-level description and https://docs.google.com/document/d/1wQw1OMgqn0blbv4Jt7ApZhR8mtN39ZLkNHKuNY-Xd_M/edit for the detailed action plan (which this work is a part of) and specification this module implements.
An upcoming PR will add the interoperability with https:/matrix-org/synapse-email-account-validity that's described in the doc (hence why this one includes references to an "expired" status).
Linters are not expected to pass until matrix-org/synapse#12327 is released with Synapse 1.57, but I've ran them locally and they're passing.
Tests are not expected to pass until matrix-org/synapse#12246 is released with Synapse 1.56, but I've ran them locally and they're passing.
The diff looks a bit scary but most of it is a copy-pasted mypy plugin from Synapse and some tests.