Recovery certificate repository (EXPOSUERAPP-7617) (#3463)

* + recovery certificate storage

* changed storage approach

* not using valuesets

* + uuid for identification

* requestCertificate

* qr code -> recovery data

* use container id

* wrong exception

* prevented race condition

* remove key if set is empty

* store json, not string set

* use type token instead of dto

* fixed "this" confusion

* no need for extraction

* do not use container id

* removed unused "registeredAt"

* removed redundant identifier

* fixed compile errors

* Fix flow emission

Co-authored-by: Mohamed Metwalli <mohamed.metwalli@sap.com>