Update context-matching logic to use earlier path edges if possible

[sachindshinde]

This PR updates context-matching logic for @context/@fromContext to use earlier edges in the GraphPath if possible. (Also a bit of logic reorganizing for performance reasons.)

Specifically, if there are key resolution or root-type resolution edges prior to the match point in the graph path, then the context can be resolved at those edges to potentially generate more optimal query plans. (This should have occurred with the handleRequires logic being reapplied to contexts, but it wasn't happening for some reason.)

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Latest commit: c94dcc3

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