Start with integration tests for invites

[nickvergessen]

• Test that it doesn't work when federation is not enabled
• Test remote participant is added to participant list
• Test invite is sent
• Test accepting an invite (any change for the inviter?)
• Test declining an invite (is the remote participant removed?)
• Test requesting the room as a remote participant
• Test if remote participants can see the participant list

[nickvergessen]

Next step

• OCM-Provider does not know about the talk federation so does not return it and therefor does not handle the invitation

[nickvergessen]

• Database has unique index on token which needs to be extended to token+server_url

[gary-kim]

This is just proving the usefulness of tests, isn't it.

I will get started on the messaging sharing after this is done.

[nickvergessen]

Not there yet, but let's merge this in between step as it fixes some issues and brings us closer without having merge conflicts at the end

[nickvergessen]

Open tasks where moved to #5723