experiment: lazily create DeferredFragments

[yaacovCR]

goal:

avoid creating or passing around the deferMap

methodology:

• each DeferredFragmentRecord will be unique for a given deferUsage and creationPath
• we annotate the path and deferUsage with a "fieldDepth" property representing the number of nested fields in the operation corresponding to the current execution path and the defer directive.
• from a path for a deferredGroupedFieldSet, we can derive the path for the deferredFragment from a given deferUsage by "rewinding" the deferredGroupedFieldSet path to the depth of the given deferUsage
• we also add a "fieldDepth" property to the FieldDetails structure as well so as to not require an additional depth argument to collectFields which would complicate memoization

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[yaacovCR]

not sure this is worth it -- but it works!!

[yaacovCR]

closing this for now as best to not modify Path, but we can always revisit