Add support for `QueryMultiple`, `QueryMultipleAsync`

[ninety7]

I have a simple net9 win x64 console app with Dapper and DapperAOT that uses QueryMultipleAsync. After publishing and running the aot compiled exe, I get the following error:

Unhandled exception: System.PlatformNotSupportedException: Dynamic code generation is not supported on this platform.
   at System.Reflection.Emit.ReflectionEmitThrower.ThrowPlatformNotSupportedException() + 0x2b
   at Dapper.SqlMapper.CreateParamInfoGenerator(SqlMapper.Identity, Boolean, Boolean, IList`1) + 0xf5
   at Dapper.SqlMapper.GetCacheInfo(SqlMapper.Identity, Object, Boolean) + 0x11b
   at Dapper.SqlMapper.<QueryMultipleAsync>d__57.MoveNext() + 0xf0

After trying several things, I just noticed that the analyzer reported that this method is not supported by Dapper.AOT.
I'm not familiar with how source generators work to know how complex would that be. How complex would it be to add support for this method? Using QueryMultipleAsync helps a lot when retrieving large amounts of data.

[jeroenhabets]

@mgravell , @andreasblueher with .Net 11 bringing many async improvements I don't know if this becomes easier but I would suspect an increase in value/demand. Did you ever notice this request?

(@ninety7 I do assume you also had Dapper in your solution? See FAQ - Does it still need Dapper itself?)

for example, if you're using the QueryMultiple API, the returned GridReader is defined inside Dapper, so it will be retained