Add implementation for mocking the EDR Cache API

[bmg13]

WHAT

Add a mock implementation for EDR Cache API in mock-connector runtime since currently is being excluded. This stubbing should be applied to the TX own implementation.

WHY

To have currently excluded api's able to be mocked and used, so a implementation of the EDR Cache API (the one now missing) is needed.

HOW

No particular implementation was defined, but alligned with existing ones seen here and here (as examples).
However, the EDR Cache API is overridden by the Tractus-X and that should be the one stubbed.

FURTHER NOTES

This issue was raised based on this feedback.

[github-actions]

This issue is stale because it has been open for 2 weeks with no activity.

[Brijeshthummar02]

@bmg13 can you explain and provide more details on issue, i would like to give it a shot also i see there's one merge PR so the issue is closed or open still.

[bmg13]

@Brijeshthummar02 the issue is open and able to be picked up at this moment, feel free to do it :)
what are your doubts? just to be able to help.