For ot-daemon to perform mDNS operations, we need to implement an AIDL
service NsdPublisher. MdnsPublisher forwards the calls to NsdManager.
For now, only register & unregster a service without a custom host is supported.
Bug: 320211657
Bug: 318323473
Test: atest CtsThreadNetworkTestCases
Change-Id: Ia392a0f57046f53973ac6bd6043dec915d170666