core/filtermaps: FilterMaps log index generator and search logic #31079
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This PR is #1 of a 3-part series that implements the new log index intended to replace core/bloombits.
Replaces #30370
This part implements the new data structure, the log index generator and the search logic. This PR has most of the complexity but it does not affect any existing code yet so maybe it is easier to review separately.
See a general overview of the indexer implementation here: https://gist.github.com/zsfelfoldi/97105dff0b1a4f5ed557924a24b9b9e7
A recent specification of the filter map data structure and an overview of the search implementation is also WIP.