feat(metadata): Implement OMDB metadata provider and refactor metadata client

- Added `OmdbProvider` to fetch movie metadata from the OMDB API.
- Refactored `MetadataClient` to use `MetadataSearchCriteria` for fetching movie metadata.
- Updated `MetadataClientImpl` to support fetching metadata using OMDB.
- Modified `log_review` use case to utilize the new metadata fetching mechanism.
- Updated tests and presentation layer to accommodate changes in metadata handling.
- Added dependencies for `reqwest` and `async-trait` in relevant `Cargo.toml` files.

.env.example

@@ -2,4 +2,5 @@ DATABASE_URL=sqlite:./dev.db
 PORT=3000
 JWT_SECRET=
 JWT_TTL_SECONDS=
-ALLOW_REGISTRATION=true
+ALLOW_REGISTRATION=true
+OMDB_API_KEY=