Make resolverOptions in ResolverParamsParcel nullable and add a new IPC setResolverOption

This information was only ever supplied by OEM code and DnsManager has never
set it to anything.

The new IPC is used to set resolver options separately.

Bug: 194048056
Test: m dnsresolver_aidl_interface-update-api
Change-Id: I81f4b12dbb06783b72883572926b2e423220a9f7