Make camera server create/destroy its janus room

README.md

camera-server/example-config.json

camera-server/package-lock.json

camera-server/package.json

camera-server/src/config/config.ts

camera-server/src/janus/janus-api.ts

camera-server/src/janus/janus-room.ts

camera-server/src/server.ts

camera-server/src/util/cleanup.ts

camera-server/src/util/random-string.ts