We are still missing the real LDT implementation, so the code is linked with a
placeholder code that doesn't do the actual encryption.
We also needed to pass the `account_name` to credential manager to choose the
correct credentials.
PiperOrigin-RevId: 483801163
Changed StartBroadcast() API to be more generic - the client app can use the
same call to start presence, fast pair or eddystone advertisement.
PiperOrigin-RevId: 470066137