feat: creating extension configuration registry

[axel7083]

What does this PR do?

Creating a dedicated registry to hold configuration (preferences) logic.

Notable changes

• ConfigurationRegistry manage the ai-lab.models.path previously managed by ModelsManager
• Creating frontend store holding the configuration values

Screenshot / video of UI

What issues does this PR fix or reference?

How to test this PR?

• [x] Unit tests has been provided

[axel7083]

Should be splut in 2 PRs as it mixes 2 different concerns

@jeffmaury I updated the PR to only focus on the creation of the ConfigurationRegistry