Add batch insert function to LocalIndex #73
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Batch insert would be very useful to us as we use Vectra to prototype RAG solutions and tend to load in a large amount of data at once.
Setup tests using node:assert to avoid modifying dependencies. Provided test cases pass

Also fixed a bug where the

itemsarray on_datawas being passed by reference in the call toObject.assign. This was causing the third test case to fail because any mutation ofthis._update.itemswas also mutatingthis._data.items(see debug repl below).