Package index optimization #5
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This PR optimizes package index load and query times by splitting it into two separate files: a lookup table, which allows for time and space efficient package reference lookups, and the index itself, which is read from offsets stored within the lookup table.
These changes supplant the need to load the entire index into memory. This reduces memory usage by at least ~170 MB and greatly improves command -> action runtime latency. This is entirely a result of the lookup table being an order of magnitude smaller than the index itself.