feat(config): Add keys to be scanned to Zebra config file

[oxarbitrage]

We want to add an array of keys to be scanned to the zebra config so we can add them to the key storage at startup.

The keys field can be a vector of tuples Vec<(String, Option<height>)> where the first argument is the viewing key as a string and height is an optional birth date. Or it can just be Vec<String> if we want to add the birth height later.

Tasks:

• Add key list to zebra config. (New "scan" section)

[teor2345]

This is blocked on #7904 as the keys present in the config should be added to the storage at startup.

If we need to unblock this ticket, we can split connecting the keys up to storage into another PR or ticket. Totally up to you.

Tasks:

• Add key list to zebra config. (New "scanner" section?)

I'd suggest scan, because most of our config names match the crate names

[oxarbitrage]

I think you are right, i unblocked it, created #7946 which is blocked on this one and in #7904