crypto: emit no identities_stream
items on no-op changes
#3442
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Fixes: element-hq/element-web#27165.
Currently, whenever we receive a
/keys/query
response, we emit items fromidentities_stream_raw
anddevices_stream
for any users listed in the response, even if there was no actual change to the devices. This PR changes behaviour so that items are only emitted if there are actual changes.