C# GenericHost changes to facilitate better Accept header support, DateOnly parsing, multitargetting, exposing more headers and proper JIT tokens #227

Job	Run time
Build .Net projects (samples/client/petstore/csharp/generichost/latest/Tags)	35s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/HelloWorld)	33s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AnyOf)	47s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/ComposedEnum)	39s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AllOf)	39s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/OneOfList)	36s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AnyOfNoCompare)	42s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/InlineEnumAnyOf)	37s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/NullReferenceTypes)	42s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/SourceGeneration)	49s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/Petstore)	41s
Build .Net projects (samples/client/petstore/csharp/httpclient/net9/Petstore-nonPublicApi)	38s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/OneOf)	1m 7s
Build .Net projects (samples/client/petstore/csharp/httpclient/net9/Petstore)	38s
Build .Net projects (samples/client/petstore/csharp/restsharp/net9/EnumMappings)	44s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/FormModels)	41s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/UseDateTimeForDate)	42s
	11m 50s

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