Managed delegates in DNS_QUERY_REQUEST makes DnsQueryEx unusable with other struct versions (e.g. DNS_QUERY_REQUEST3)

Is your feature request related to a problem? Please describe.
CsWin32 currently doesn't support DnsQueryEx() with DNS_QUERY_REQUEST3 struct because DnsQueryEx() is getting an in parameter instead of a pointer parameter is that DNS_QUERY_REQUEST3 is detected to be a managed type because one of its fields (pQueryCompletionCallback) is a delegate. One cannot take a pointer to a struct with a delegate typed field. This leaves use the options to either setting allowMarshaling:off on a project level which cause additional errors because some other delegate type needs to be changed to pointer type or declaring our own DnsQueryEx() extern method.

Describe the solution you'd like
It would be great if we can selectively choose certain APIs to set allowMarshaling:off.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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Start with the DnsQueryEx API and the DNS_QUERY_REQUEST3 structure described in the issue, then trace how CsWin32 detects managed fields and applies allowMarshaling. Identify the existing tests for generated signatures and add coverage for selectively disabling marshaling on this API. Done means DnsQueryEx can use the relevant struct pointer while other generated delegate types retain their current behavior.