Share more RequestDelegateFactory.CreateArgument logic with EndpointMetadataApiDescriptionProvider

[halter73]

This would probably involve defining some well-known internal BindingSource string constants. Shouldn't be too complicated though.

See #33433 (comment)

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We're moving this issue to the .NET 7 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
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