Merge #2584

2584: Format API keys in hexa instead of base64 r=curquiza a=ManyTheFish

This PR:
- Changes API key generation and formatting to ease the generation of the key made by our users
- updates the `uuid` crate version

The API key can now be generated in bash as below:
```sh
echo -n $HYPHENATED_UUID | openssl dgst -sha256 -hmac $MASTER_KEY
```

fixes the issue raised in [product/discussion#421](https://github.com/meilisearch/product/discussions/421#discussioncomment-3079410), this should not impact anything in documentation nor integration but ease the key generation on the user sides.

poke `@gmourier` 

Co-authored-by: ManyTheFish <many@meilisearch.com>

meilisearch-http/Cargo.toml

@@ -75,7 +75,7 @@ thiserror = "1.0.30"
 time = { version = "0.3.7", features = ["serde-well-known", "formatting", "parsing", "macros"] }
 tokio = { version = "1.17.0", features = ["full"] }
 tokio-stream = "0.1.8"
-uuid = { version = "0.8.2", features = ["serde", "v4"] }
+uuid = { version = "1.1.2", features = ["serde", "v4"] }
 walkdir = "2.3.2"
 
 [dev-dependencies]