Improve OData Uri parser in 8

[xuzhg]

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[marabooy]

@xuzhg one improvement that could be added is the possibility of parsing urls in a case insensitive manner. This allows canonicalized urls to be parsed without any errors.

[marabooy]

Found that using ParseDynamicPathSegmentFunc could have one override this behavior easily.

[habbes]

Maybe we should also consider decoupling the syntax parse from the edm model? I think there have been requests in the past for validating an odata url without relying on the model. I'm not sure if this is still relevant today.

[corranrogue9]

It would be good to remove the requirement to load a model for any sort of parsing, we might factor in a way where we separate operations that require the model from operations that don't. This might be code that exists, but it might just not be exposed.

@xuzhg, it seems possible (though unlikely) that this is not a breaking change. Can you please flesh out a little bit the proposed new interfaces so we can see what the breaks would be?