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We should rebase on master again - the changes in a0fb945 change the structure for our ffi modules (all are moved to the redissearch_rs crate)

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.17%. Comparing base (3127c69) to head (c6210b5).
Report is 104 commits behind head on master.

@@            Coverage Diff             @@
##           master    #5996      +/-   ##
==========================================
- Coverage   87.23%   87.17%   -0.07%     
==========================================
  Files         198      196       -2     
  Lines       36052    35968      -84     
==========================================
- Hits        31449    31354      -95     
- Misses       4603     4614      +11     

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I think this PR is ready for a review. I split some of the changes to separate PRs. However, this PR is still based on #6122 and #6102 so those should go first. They're both trivial anyway.

Let's split this PR in 3 smaller ones:

1. varintand VectorWriter pure Rust implementations, with docs, tests and microbenchmarks
2. Buffer. Let's add tests and document our safety invariants, following the same style we use in trie_rs/low_memory_thin_vec (basically this style).
3. The C integration