Merge #4304

4304: Add CUDA GPU support for Hugging Face embedders r=Kerollmops a=dureuill

Adds a "cuda" feature to `milli`.

Compiling with this feature requires that the CUDA support library be installed (see "with CUDA support" paragraph in https://huggingface.github.io/candle/guide/installation.html), and adds CUDA support to the `huggingFace` embedder.

To enable GPU support, users will need to:

1. Have a compatible NVidia GPU under Linux
2. Follow [the guide](https://huggingface.github.io/candle/guide/installation.html) to install the CUDA dependencies
3. Compile Meilisearch with the `cuda` feature: `cargo build --release --features cuda`

# Impact

Enabling the CUDA feature allows to use an available GPU to compute embeddings with a `huggingFace` embedder. 
On an AWS Graviton 2, this yields a x3 - x5 improvement on indexing time.

# Technical details

- I had to change the CI so that the cuda feature is not included in the `Tests all features` workflow
- To achieve that, I had to add a binary following the `cargo xtask` design pattern, to list all features excepted the cuda one.
- I then changed the workflow accordingly (renamed to "Tests almost all features" 😉)
- A test run of the new feature was done on a temporary version of this PR that had it enabled for PRs: [See the results here](https://github.com/meilisearch/meilisearch/actions/runs/7461331929/job/20301216732)

Co-authored-by: Louis Dureuil <louis@meilisearch.com>

.github/workflows/test-suite.yml

@@ -82,7 +82,7 @@ jobs:
           args: --locked --release --all
 
   test-all-features:
-    name: Tests all features
+    name: Tests almost all features
     runs-on: ubuntu-latest
     container:
       # Use ubuntu-18.04 to compile with glibc 2.27, which are the production expectations
@@ -98,16 +98,12 @@ jobs:
         with:
           toolchain: stable
           override: true
-      - name: Run cargo build with all features
-        uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --workspace --locked --release --all-features
-      - name: Run cargo test with all features
-        uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --workspace --locked --release --all-features
+      - name: Run cargo build with almost all features
+        run: |
+          cargo build --workspace --locked --release --features "$(cargo xtask list-features --exclude-feature cuda)"
+      - name: Run cargo test with almost all features
+        run: |
+          cargo test --workspace --locked --release --features "$(cargo xtask list-features --exclude-feature cuda)"
 
   test-disabled-tokenization:
     name: Test disabled tokenization