feat(auth): API keys

implements:
https://github.com/meilisearch/specifications/blob/develop/text/0085-api-keys.md

- Add tests on API keys management route (meilisearch-http/tests/auth/api_keys.rs)
- Add tests checking authorizations on each meilisearch routes (meilisearch-http/tests/auth/authorization.rs)
- Implement API keys management routes (meilisearch-http/src/routes/api_key.rs)
- Create module to manage API keys and authorizations (meilisearch-auth)
- Reimplement GuardedData to extend authorizations (meilisearch-http/src/extractors/authentication/mod.rs)
- Change X-MEILI-API-KEY by Authorization Bearer (meilisearch-http/src/extractors/authentication/mod.rs)
- Change meilisearch routes to fit to the new authorization feature (meilisearch-http/src/routes/)

- close #1867

meilisearch-http/src/extractors/authentication/error.rs

@@ -2,15 +2,13 @@ use meilisearch_error::{Code, ErrorCode};
 
 #[derive(Debug, thiserror::Error)]
 pub enum AuthenticationError {
-    #[error("The X-MEILI-API-KEY header is missing.")]
+    #[error("The Authorization header is missing. It must use the bearer authorization method.")]
     MissingAuthorizationHeader,
     #[error("The provided API key is invalid.")]
     InvalidToken(String),
     // Triggered on configuration error.
     #[error("An internal error has occurred. `Irretrievable state`.")]
     IrretrievableState,
-    #[error("An internal error has occurred. `Unknown authentication policy`.")]
-    UnknownPolicy,
 }
 
 impl ErrorCode for AuthenticationError {
@@ -19,7 +17,6 @@ impl ErrorCode for AuthenticationError {
             AuthenticationError::MissingAuthorizationHeader => Code::MissingAuthorizationHeader,
             AuthenticationError::InvalidToken(_) => Code::InvalidToken,
             AuthenticationError::IrretrievableState => Code::Internal,
-            AuthenticationError::UnknownPolicy => Code::Internal,
         }
     }
 }