[WIP] Add pinned memory resource to C API

[ajit283]

Let me know if this is out of scope for cuVS!

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[cjnolet]

/ok to test

[cjnolet]

@ajit283 it would be a lot easier to review this PR (and faster to merge it) if you were to isolate the pinned memory resource from the go api changes.

[ajit283]

@cjnolet oh sorry, I didn't mean to include those at all

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[benfred]

/ok to test

[cjnolet]

/ok to test

[cjnolet]

/ok to test

[cjnolet]

/merge