Replace Marshal by Granular_marshal in ocaml-index #1889
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Initial PR presentation by @Lucccyo:
The current implementation of ocaml-index uses Marshal to store on the disk the data.
Searching for occurrences on massive projects is time-consuming because the search loads all the data structures from the disk to perform the search.
This Pull Request aims to replace Marshal with a granular version to make the ocaml-index more efficient in reading.
It comes with two granular implementations of the data structures set and map, based on the Stdlib implementation.
During a search operation, the program lazily loads only the required part of the ocaml-index.
It works because the heavy nodes of the granular_map and granular_set have link indirections,
introducing serialization boundaries, which allows Marshal to delay the deserialization of their children.