[dnssd] allow Dnssd platform to use native OT mDNS modules (#9944)

Updates the `Dnssd` module to allow it use

- Either the native OT mDNS implementation
- Or use the platform `otPlatDnssd` APIs (delegated to platform)

Also adds `OPENTHREAD_CONFIG_MULTICAST_DNS_AUTO_ENABLE_ON_INFRA_IF`
for mDNS module to be automatically enabled/disabled on the same
infra-if used for border routing based on infra-if state.

script/check-scan-build

@@ -61,6 +61,7 @@ OT_BUILD_OPTIONS=(
     "-DOT_JOINER=ON"
     "-DOT_LOG_LEVEL_DYNAMIC=ON"
     "-DOT_MAC_FILTER=ON"
+    "-DOT_MDNS=ON"
     "-DOT_MESH_DIAG=ON"
     "-DOT_NAT64_BORDER_ROUTING=ON"
     "-DOT_NAT64_TRANSLATOR=ON"

script/make-pretty

@@ -122,6 +122,7 @@ OT_CLANG_TIDY_BUILD_OPTS=(
     '-DOT_LINK_METRICS_INITIATOR=ON'
     '-DOT_LINK_METRICS_SUBJECT=ON'
     '-DOT_MAC_FILTER=ON'
+    '-DOT_MDNS=ON'
     '-DOT_MESH_DIAG=ON'
     '-DOT_NAT64_BORDER_ROUTING=ON'
     '-DOT_NAT64_TRANSLATOR=ON'