Replace libstatslog_rust with libstatslog_dns_resolver_rust

libstatslog_rust was first implemented for "//apex_available:platform".
Rust usages in other apex should define a dedicated libstatslog rust
library.

This change adds libstatslog_dns_resolver_rust and replace
libstatslog_rust usages in DnsResolver module with it.

min_sdk_version is set to 29 to be compatible with aosp/249206898 while
stats-log-api-gen rust writer does not support API_Q.

https://cs.android.com/android/platform/superproject/main/+/main:frameworks/proto_logging/stats/stats_log_api_gen/rust_writer.cpp;l=307-310;drc=527206267db5b67b756acac7cd878fd2189793f0

Bug: 392816523
Test: atest doh_unit_test libdoh_ffi_for_test

Change-Id: Ie72f1c904a3ef30c685f52df61b638537cf1d382