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bbcee5a0d6clusterlin: improve rechunking in LinearizationChunking (optimization) (Pieter Wuille)04d7a04ea4clusterlin: add MergeLinearizations function + fuzz test + benchmark (Pieter Wuille)4f8958d756clusterlin: add PostLinearize + benchmarks + fuzz tests (Pieter Wuille)0e2812d293clusterlin: add algorithms for connectedness/connected components (Pieter Wuille)0e52728a2dclusterlin: rename Intersect -> IntersectPrefixes (Pieter Wuille) Pull request description: Part of cluster mempool: #30289 Depends on #30126, and was split off from it. #28676 depends on this. This adds the algorithms for merging & postprocessing linearizations. The `PostLinearize(depgraph, linearization)` function performs an in-place improvement of `linearization`, using two iterations of the [Linearization post-processing](https://delvingbitcoin.org/t/linearization-post-processing-o-n-2-fancy-chunking/201/8) algorithm. The first running from back to front, the second from front to back. The `MergeLinearizations(depgraph, linearization1, linearization2)` function computes a new linearization for the provided cluster, given two existing linearizations for that cluster, which is at least as good as both inputs. The algorithm is described at a high level in [merging incomparable linearizations](https://delvingbitcoin.org/t/merging-incomparable-linearizations/209). For background and references, see [Introduction to cluster linearization](https://delvingbitcoin.org/t/introduction-to-cluster-linearization/1032). ACKs for top commit: sdaftuar: ACKbbcee5a0d6glozow: code review ACKbbcee5a0d6instagibbs: ACKbbcee5a0d6Tree-SHA512: d2b5a3f132d1ef22ddf9c56421ab8b397efe45b3c4c705548dda56f5b39fe4b8f57a0d2a4c65b338462d80bb5b9b84a9a39efa1b4f390420a8005ce31817774e