First cut of the a module to derive usernames from 3PIDs #1
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This is happening in the context of mainlining the fork of Synapse used for Tchap, and migrates an existing feature from the Tchap fork into a module, leveraging the callback and module API added in matrix-org/synapse#11790.
Most of the code in this module has been copied over from https://github.com/matrix-org/synapse-dinsic/blob/d1fedca096250e04c8f1b7101003f3f4cfddea9a/synapse/rest/client/register.py#L622-L670
CI is expected to fail since the callback and module API used haven't been released in Synapse yet.