Test for passing through unsigned
data in /keys/query
#749
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We'd like a mechanism by which a client can add "unsigned" data to their device keys, and have it be accessible by other clients involved in E2EE discussions.
An MSC for this behaviour is pending, but will be matrix-org/matrix-spec-proposals#4229.
This PR adds a test for that functionality. It tests functionality added in element-hq/synapse#17951.
Part of element-hq/element-meta#2467.