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4900: Indexer edition 2024 r=Kerollmops a=dureuill This PR is implementing the indexer edition 2024, largely inspired by [the ideas from this blog post](https://blog.kerollmops.com/meilisearch-is-too-slow). Fixes https://github.com/meilisearch/meilisearch/issues/4985 ## Features - Stream-first approach to reading documents. - Minimum disk write operations. - RAM usage-first approach to avoid modifying common bitmaps on disk but in memory. - Reduced LMDB fragmentation by writing entries only once... - ...computing the final version of the entries in parallel... - ...and storing them in write-optimized data structures before sending them to the BTree (LMDB). - Indexing in multiple transactions to improve large dataset support (dumps). Co-authored-by: ManyTheFish <many@meilisearch.com> Co-authored-by: Clément Renault <clement@meilisearch.com> Co-authored-by: Louis Dureuil <louis@meilisearch.com>