Anchor pre-PR: Modularize validator store (#6771)

* pass slots_per_epoch at runtime

* remove generic E from unrequired types

* move `validator_store` to `lighthouse_validator_store`

* make validator_store into a trait

* further reduce dependencies

* remove `environment` dependency on `beacon_node_fallback`

* Manually pull in some changes from tracing-integration (thanks sayan!)

Co-authored-by: ThreeHrSleep <threehrsleep@gmail.com>

* remove `environment` from `validator_services`

* unify boost factor accessors

* add builder for DutiesService

* Manually merge tracing PR for beacon_node_fallback

Co-authored-by: ThreeHrSleep <threehrsleep@gmail.com>

* Fix chain_spec for BlockService

* address review

* remove PhantomData from SyncDutiesMap

* fix tests

* correct test

* Add `E` to `ValidatorStore` as associated type

* fix tests

* derive Clone for ValidatorStore's Error and required sub-errors

* switch to enum for block signing to allow differing types

---------

Co-authored-by: João Oliveira <hello@jxs.pt>
Co-authored-by: ThreeHrSleep <threehrsleep@gmail.com>
Co-authored-by: Jimmy Chen <jimmy@sigmaprime.io>

validator_client/slashing_protection/src/lib.rs

@@ -27,7 +27,7 @@ pub const SLASHING_PROTECTION_FILENAME: &str = "slashing_protection.sqlite";
 /// The attestation or block is not safe to sign.
 ///
 /// This could be because it's slashable, or because an error occurred.
-#[derive(PartialEq, Debug)]
+#[derive(PartialEq, Debug, Clone)]
 pub enum NotSafe {
     UnregisteredValidator(PublicKeyBytes),
     DisabledValidator(PublicKeyBytes),