Migrate camera server to Typescript

.gitignore

camera-server/models/validation-error.js

camera-server/package-lock.json

camera-server/package.json

camera-server/src/models/camera-slot-state.ts

camera-server/src/models/sender-socket.ts

camera-server/src/models/validation-error.ts

camera-server/src/server.ts

camera-server/src/util/cleanup.ts

camera-server/test-server.js

camera-server/tsconfig.json