Implement a charm lib for pod-defaults relation

[NohaIhab]

Context

resource-dispatcher charm is currently using SDI to handle the relation pod-defaults, the team is moving away from using SDI, so we should write a charm library to handle the relation events and data transfer logic.

What needs to get done

1. Implement the charm library in resource-dispatcher with a provider and requirer classes
2. add tests for the charm library
3. rewrite the charms that use this relation to use the library, the charms are mlflow-operator and the new ngc charm -> tasks to be created

Definition of Done

• resource-dispatcher charm is handling the pod-defaults relation correctly using the charm library rather than SDI
• there is good test coverage for the charm library and tests are passing

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5184.

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