Implement factory pattern for AASService

[gomezbc]

Description

Since we will support several AAS API versions, AASService should implement factory pattern.

Acceptance Criteria

• Abstract classes that defines the required methods following the AAS API spec -> DescriptionApi, LookupApi, ShellDescriptorsApi
• AASService is instantiated via a factory patterns

Additional Information

After implementing all AASService methods, I will start working in this refactor

[CDiezRodriguez]

@gomezbc, if you haven’t already started working on this issue, I think we can lower the priority until we accomplish the main points. Or at least make this one of the last tasks. What do you think?

[gomezbc]

@gomezbc, if you haven’t already started working on this issue, I think we can lower the priority until we accomplish the main points. Or at least make this one of the last tasks. What do you think?

True, our priority should be implementing the core functionalities. I haven't started yet, and this issue also depends on the adapters PR, so let's lower its priority.

[CDiezRodriguez]

Milestone 25.09