Accept and decline invites (#806)

* Add accept/decline invite api

* Fix isDirect logic

* Add logic for accepting/decling invites

* Add error handling structure

* Add decline alert

* Add navigation to joined room

* Add generic error

* Add changelog.d file

* Cleanup

* Fix failing UTs

* Add UTs

* Add UI tests

* Cleanup

* Update ref screenshots

* Refactor invitesScreen state

* Improve switch handling in UserSessionFlowCoordinator

* Fix build error

UITests/Sources/__Snapshots__/Application/en-GB-iPad-9th-generation.invites-1.png

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UITests/Sources/__Snapshots__/Application/en-GB-iPhone-14.invites-1.png

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UITests/Sources/__Snapshots__/Application/pseudo-iPad-9th-generation.invites-1.png

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UITests/Sources/__Snapshots__/Application/pseudo-iPhone-14.invites-1.png

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