More Podlang parser performance improvements - #533
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This PR builds on #532 to speed up the Podlang parser using various tweaks and bottleneck removals.
Mostly this means parallelizing using Rayon where possible, eliminating some quadratic search behaviour in
CustomPredicateBatchBuilder, and making sure that fast paths/early exits are taken whenever they can be.This cuts
pexe buildby about 50% for the microverse example. The remaining cost is partly in Merkle tree building, which we can address by bulk-building Merkle trees rather than iteratively inserting each new entry. Since the Merkle tree implementation is a dependency for many parts of the library, I will leave this for another PR.