Move crates under a sub folder to clean up the code

crates/benchmarks/README.md

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+Benchmarks
+==========
+
+## TOC
+
+- [Run the benchmarks](#run-the-benchmarks)
+- [Comparison between benchmarks](#comparison-between-benchmarks)
+- [Datasets](#datasets)
+
+## Run the benchmarks
+
+### On our private server
+
+The Meili team has self-hosted his own GitHub runner to run benchmarks on our dedicated bare metal server.
+
+To trigger the benchmark workflow:
+- Go to the `Actions` tab of this repository.
+- Select the `Benchmarks` workflow on the left.
+- Click on `Run workflow` in the blue banner.
+- Select the branch on which you want to run the benchmarks and select the dataset you want (default: `songs`).
+- Finally, click on `Run workflow`.
+
+This GitHub workflow will run the benchmarks and push the `critcmp` report to a DigitalOcean Space (= S3).
+
+The name of the uploaded file is displayed in the workflow.
+
+_[More about critcmp](https://github.com/BurntSushi/critcmp)._
+
+💡 To compare the just-uploaded benchmark with another one, check out the [next section](#comparison-between-benchmarks).
+
+### On your machine
+
+To run all the benchmarks (~5h):
+
+```bash
+cargo bench
+```
+
+To run only the `search_songs` (~1h), `search_wiki` (~3h), `search_geo` (~20m) or `indexing` (~2h) benchmark:
+
+```bash
+cargo bench --bench <dataset name>
+```
+
+By default, the benchmarks will be downloaded and uncompressed automatically in the target directory.<br>
+If you don't want to download the datasets every time you update something on the code, you can specify a custom directory with the environment variable `MILLI_BENCH_DATASETS_PATH`:
+
+```bash
+mkdir ~/datasets
+MILLI_BENCH_DATASETS_PATH=~/datasets cargo bench --bench search_songs # the four datasets are downloaded
+touch build.rs
+MILLI_BENCH_DATASETS_PATH=~/datasets cargo bench --bench songs # the code is compiled again but the datasets are not downloaded
+```
+
+## Comparison between benchmarks
+
+The benchmark reports we push are generated with `critcmp`. Thus, we use `critcmp` to show the result of a benchmark, or compare results between multiple benchmarks.
+
+We provide a script to download and display the comparison report.
+
+Requirements:
+- `grep`
+- `curl`
+- [`critcmp`](https://github.com/BurntSushi/critcmp)
+
+List the available file in the DO Space:
+
+```bash
+./benchmarks/script/list.sh
+```
+```bash
+songs_main_09a4321.json
+songs_geosearch_24ec456.json
+search_songs_main_cb45a10b.json
+```
+
+Run the comparison script:
+
+```bash
+# we get the result of ONE benchmark, this give you an idea of how much time an operation took
+./benchmarks/scripts/compare.sh son songs_geosearch_24ec456.json
+# we compare two benchmarks
+./benchmarks/scripts/compare.sh songs_main_09a4321.json songs_geosearch_24ec456.json
+# we compare three benchmarks
+./benchmarks/scripts/compare.sh songs_main_09a4321.json songs_geosearch_24ec456.json search_songs_main_cb45a10b.json
+```
+
+## Datasets
+
+The benchmarks uses the following datasets:
+- `smol-songs`
+- `smol-wiki`
+- `movies`
+- `smol-all-countries`
+
+### Songs
+
+`smol-songs` is a subset of the [`songs.csv` dataset](https://milli-benchmarks.fra1.digitaloceanspaces.com/datasets/songs.csv.gz).
+
+It was generated with this command:
+
+```bash
+xsv sample --seed 42 1000000 songs.csv -o smol-songs.csv
+```
+
+_[Download the generated `smol-songs` dataset](https://milli-benchmarks.fra1.digitaloceanspaces.com/datasets/smol-songs.csv.gz)._
+
+### Wiki
+
+`smol-wiki` is a subset of the [`wikipedia-articles.csv` dataset](https://milli-benchmarks.fra1.digitaloceanspaces.com/datasets/wiki-articles.csv.gz).
+
+It was generated with the following command:
+
+```bash
+xsv sample --seed 42 500000 wiki-articles.csv -o smol-wiki-articles.csv
+```
+
+_[Download the `smol-wiki` dataset](https://milli-benchmarks.fra1.digitaloceanspaces.com/datasets/smol-wiki-articles.csv.gz)._
+
+### Movies
+
+`movies` is a really small dataset we uses as our example in the [getting started](https://www.meilisearch.com/docs/learn/getting_started/quick_start)
+
+_[Download the `movies` dataset](https://www.meilisearch.com/movies.json)._
+
+
+### All Countries
+
+`smol-all-countries` is a subset of the [`all-countries.csv` dataset](https://milli-benchmarks.fra1.digitaloceanspaces.com/datasets/all-countries.csv.gz)
+It has been converted to jsonlines and then edited so it matches our format for the `_geo` field.
+
+It was generated with the following command:
+```bash
+bat all-countries.csv.gz | gunzip | xsv sample --seed 42 1000000 | csv2json-lite | sd '"latitude":"(.*?)","longitude":"(.*?)"' '"_geo": { "lat": $1, "lng": $2 }' | sd '\[|\]|,$' '' | gzip > smol-all-countries.jsonl.gz
+```
+
+_[Download the `smol-all-countries` dataset](https://milli-benchmarks.fra1.digitaloceanspaces.com/datasets/smol-all-countries.jsonl.gz)._
+