Move notifier and latency service to validator_services (#7427)

We would like to reuse the `notifier` and `latency_service` in Anchor. To make this possible, this PR moves these from `validator_client` to `validator_services` and makes them use the new `ValidatorStore` trait is used so that the code can be reused in Anchor.

validator_client/validator_services/src/lib.rs

@@ -1,6 +1,8 @@
 pub mod attestation_service;
 pub mod block_service;
 pub mod duties_service;
+pub mod latency_service;
+pub mod notifier_service;
 pub mod preparation_service;
 pub mod sync;
 pub mod sync_committee_service;