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vector: Optimize filters by indexing feature data

James Westman requested to merge jwestman/libshumate:optimization-tile-indexing into main

Added ShumateVectorIndexBitset, which compactly stores a single bit for each feature in a layer. This lets us create indexes of feature data that are reusable across style layers, and "any" and "all" expressions are implemented on these indexes very efficiently using bitwise operations.

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