[csharp] public TokenProvider to make it implementable from consumer projects #263

Job	Run time
Build .Net projects (samples/client/petstore/csharp/generichost/latest/Tags)	42s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AllOf)	41s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AnyOf)	43s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/ComposedEnum)	38s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/Petstore)	47s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/OneOfList)	44s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/FormModels)	47s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/OneOf)	48s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/AnyOfNoCompare)	41s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/InlineEnumAnyOf)	47s
Build .Net projects (samples/client/petstore/csharp/generichost/latest/HelloWorld)	38s
Build .Net projects (samples/client/petstore/csharp/restsharp/net9/EnumMappings)	46s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/NullReferenceTypes)	46s
Build .Net projects (samples/client/petstore/csharp/httpclient/net9/Petstore-nonPublicApi)	35s
Build .Net projects (samples/client/petstore/csharp/httpclient/net9/Petstore)	42s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/UseDateTimeForDate)	52s
Build .Net projects (samples/client/petstore/csharp/generichost/net9/SourceGeneration)	48s
	12m 25s

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