feat(subroom audio): introduce subroom audio

Emre Neumannrequested to merge
e.neumann/web-app:subroom-audio into main

feat(subroom audio): introduce subroom audio

requires https://git.opentalk.dev/opentalk/backend/services/controller/-/merge_requests/1269 (merged to main) for testing

closes #2259

Edited by Stefan Sydow

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