This commit adds support of advertising and discovering services
with subtypes.
With this change, client can publish a new service with subtypes with
code:
```
NsdServiceInfo info = new NsdServiceInfo();
info.setServiceName("My Service");
info.setServiceType("_meshcop._udp");
info.setSubtypes(Set.of("_abc"));
nsdManager.registerService(info, PROTOCOL_DNS_SD, listener);
```
Bug: 265095929
Test: atest CtsNetTestCases FrameworksNetTests
Change-Id: Ia83182e2d43002243d1ef4357d14a8056d7da14b
6d618d77fe