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Part of the Tchap mainlining.
This module derives an username from an email address in the form "John Doe [Acme]". See the tests and the comments in
_map_email_to_displayname
for the specifics.This change copies the behaviour from this bit of synapse-dinsic, and copies the two companion functions that can be found here.
CI is expected to fail due to matrix-org/synapse#12009 not having merged yet, but I've ran the tests and linters locally and it's all green.