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cluster mempool: add txgraph diagrams/mining/eviction

Placeholder Pieter Wuille requested to merge github/fork/sipa/202412_txgraph_index into master

Part of cluster mempool: #30289

This builds on #31363, adding more functionality to the txgraph module, specifically:

  • TxGraph::GetMainStagingDiagrams(), a function to obtain feerate diagrams for both the main graph and the staged changes to it, including only the clusters that differ between the two.
  • TxGraph::GetBlockBuilder(), a function to obtain an object which can efficiently iterate the chunks of the (main) graph from high to low chunk feerate, allowing each to be skipped or included.
  • TxGraph::GetWorstMainChunk(), a function to obtain the last chunk that would be returned by GetBlockBuilder()'s returned object, intended for eviction.

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