Merge bitcoin/bitcoin#29242: Mempool util: Add RBF diagram checks for single chunks against clusters of size 2

72959867784098137a50c34f86deca8235eef4f8 Unit tests for CalculateFeerateDiagramsForRBF (Greg Sanders)
b767e6bd47cb0fb8f7aea3fb10c597e59a35bf74 test: unit test for ImprovesFeerateDiagram (Greg Sanders)
7e89b659e1ddd0c04fa2bddba9706b5d1a1daec3 Add fuzz test for FeeFrac (Greg Sanders)
4d6528a3d6bf3821c216c68f99170e2faab5d63c fuzz: fuzz diagram creation and comparison (Greg Sanders)
e9c5aeb11d641b8cae373452339760809625021d test: Add tests for CompareFeerateDiagram and CheckConflictTopology (Greg Sanders)
588a98dccc5dbb6e331f28d83a4a10a13d70eb31 fuzz: Add fuzz target for ImprovesFeerateDiagram (Greg Sanders)
2079b80854e2595f6f696e7c13a56c7f2a7da9f4 Implement ImprovesFeerateDiagram (Greg Sanders)
66d966dcfaad3638f84654e710f403cb0a0a2ac7 Add FeeFrac unit tests (Greg Sanders)
ce8e22542ed0b4fa5794d3203207146418d59473 Add FeeFrac utils (Greg Sanders)

Pull request description:

  This is a smaller piece of https://github.com/bitcoin/bitcoin/pull/28984 broken off for easier review.

  Up to date explanation of diagram checks are here: https://delvingbitcoin.org/t/mempool-incentive-compatibility/553

  This infrastructure has two near term applications prior to cluster mempool:
  1) Limited Package RBF(https://github.com/bitcoin/bitcoin/pull/28984): We want to allow package RBF only when we know it improves the mempool. This narrowly scoped functionality allows use with v3-like topologies, and will be expanded at some point post-cluster mempool when diagram checks can be done efficiently against bounded cluster sizes.
  2) Replacement for single tx RBF(in a cluster size of up to two) against conflicts of up to cluster size two. `ImprovesFeerateDiagram` interface will have to change for this use-case, which is a future direction to solve certain pins and improve mempool incentive compatibility: https://delvingbitcoin.org/t/ephemeral-anchors-and-mev/383#diagram-checks-fix-this-3

  And longer-term, this would be the proposed way we would compute incentive compatibility for all conflicts, post-cluster mempool.

ACKs for top commit:
  sipa:
    utACK 72959867784098137a50c34f86deca8235eef4f8
  glozow:
    code review ACK 72959867784098137a50c34f86deca8235eef4f8
  murchandamus:
    utACK 72959867784098137a50c34f86deca8235eef4f8
  ismaelsadeeq:
    Re-ACK https://github.com/bitcoin/bitcoin/commit/72959867784098137a50c34f86deca8235eef4f8
  willcl-ark:
    crACK 72959867784098137a50c34f86deca8235eef4f8
  sdaftuar:
    ACK 72959867784098137a50c34f86deca8235eef4f8

Tree-SHA512: 79593e5a087801c06f06cc8b73aa3e7b96ab938d3b90f5d229c4e4bfca887a77b447605c49aa5eb7ddcead85706c534ac5eb6146ae2396af678f4beaaa5bea8e

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