PIM configuration includes dataset and variable-update APIs

### User Story Description

VISOR's PIM configuration need to have the following added:

- add_dataset
- list_datasets
- remove_dataset
-list_variables
- update_variables

### Acceptance Criteria

VISOR's PIM configuration has been updated to include the APIs listed above.

### Additional Links

_No response_

### Requires new or update to third party ? If "yes" add the name(s) and the version(s) of the Third Party Software.

No

### Name and Version for Third Parties

_No response_

The issue names no files or tests. Start by locating the PIM configuration entry point and existing API methods, then follow their patterns for the five requested methods; done means all listed APIs are exposed in the configuration and pass the project's relevant checks.

Rédigé par le modèle d'indexation à partir du texte de l'issue.