Implement batch read for the `apps` driver

[jelveh]

We need to improve the apps driver to support batch read operations. This will allow developers to retrieve multiple apps simultaneously using the read (or list maybe?) method.

This implementation is crucial for replacing the old /apps endpoint with the more modern apps driver. The older endpoint supported batch read, which is highly performant in many situations, such as when opening the start menu and listing the apps.

Acceptance Criteria

Modify the read method of the apps driver so that:

• The read method can accept a single identifier or an array of identifiers
• Both UIDs and names are valid identifiers
• The method returns a single app object when given a single identifier
• The method returns an array of app objects when given multiple identifiers
• Non-existent apps are handled appropriately (e.g., null values or error messages)
• Performance tests show significant improvement over multiple single-app reads
• Document the new functionality clearly in the API documentation

[KernelDeimos]

This needs to be considered carefully as it changes the EntityStorage interface. I'm adding a label for anything related to entity-storage.