C# GenericHost changes to facilitate better Accept header support, DateOnly parsing, multitargetting, exposing more headers and proper JIT tokens #234

Job	Run time
Build .Net projects (samples/client/petstore/csharp/generichost/latest/HelloWorld)	46s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/Tags)	40s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AnyOfNoCompare)	45s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AllOf)	51s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/NullReferenceTypes)	47s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/InlineEnumAnyOf)	41s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/OneOfList)	35s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/FormModels)	43s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/Petstore)	44s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/ComposedEnum)	1m 3s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/OneOf)	43s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/SourceGeneration)	47s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/UseDateTimeForDate)	53s
Build .Net projects (samples/client/petstore/csharp/httpclient/net9/Petstore)	40s
Build .Net projects (samples/client/petstore/csharp/httpclient/net9/Petstore-nonPublicApi)	42s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AnyOf)	40s
Build .Net projects (samples/client/petstore/csharp/restsharp/net9/EnumMappings)	41s
	12m 41s

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