feat(zebra-scan): Connect with zebrad

[oxarbitrage]

Motivation

We want to pass the keys that are in the config from zebrad to zebra-scan at node startup.

Close #7946

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Solution

• In zebrad/src/comamnds/start.rs a Storage RAM database is created and the keys are dumped into it form config. Then the scan task is spawned with the created storage instance and the state.
• The scan task is at zebra-scan/src/scan.rs. The task just print some logs at the moment for testing purposes.

Testing

• A test was added to zebrad/test/accpentance.rs.

Review

I think anyone can review.

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Follow Up Work

[teor2345]

I'm not sure what errors you're getting, so I've tried to make some suggestions about what it could be.

I can also look at the specific error if you post the code or the error.

[teor2345]

Looks good, since this is blocking other work, let's merge and replace things later.

I just quickly removed the panic that happens when the state is empty.