fix(fuel-web-utils): load key from db and store for 10 minutes

[luizstacio]

This pull request refactors the API key management system by removing database preloading for API keys, introducing expiration logic for in-memory storage, and simplifying related code. The changes aim to improve performance and reduce unnecessary database operations while maintaining functionality.

Refactoring API key management:

• Removed the load_from_db method in ApiKeysManager and eliminated the preloading of API keys from the database during initialization in ServerState for both services/api and services/webserver. This simplifies the initialization process and avoids redundant caching logic. [1] [2] [3]

Enhancements to in-memory API key storage:

• Updated InMemoryApiKeyStorage to store API keys with a timestamp (DashMap<String, (ApiKey, Instant)>) and introduced expiration logic. Keys older than 10 minutes are considered expired and removed during retrieval or lookup. [1] [2] [3] [4]

Simplification of storage key generation:

• Simplified the storage_key method in ApiKey to directly use the key field instead of concatenating the id and user fields.

Code cleanup:

• Removed unused KeyStorage trait import in services/api/src/server/state.rs and services/webserver/src/server/state.rs to clean up imports. [1] [2]