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datastore: Update AllocateIDs to take keys.

Update the Datastore's AllocateIDs call to accept variadic arguments similar
to Get/Put/Delete/Exists. Structs can be supplied to populate their keys
directly, and keys or key slices can be supplied to directly allocate keys.

This adds some Key helper functions:
- SameKind, which asserts that keys reference the same kind.
- Partial, which returns a partial key given a source key.
- WithID, which returns a derivative key with the specified ID.
- NewIncompleteKeys, which allocates a slice of incomplete keys given a kind.

BUG=

Review-Url: https://codereview.chromium.org/2007123002

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