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/graffiti_file/src/lib.rs

@@ -1,5 +1,4 @@
 use serde::{Deserialize, Serialize};
-use slog::warn;
 use std::collections::HashMap;
 use std::fs::File;
 use std::io::{prelude::*, BufReader};
@@ -108,19 +107,14 @@ fn read_line(line: &str) -> Result<(Option<PublicKeyBytes>, Graffiti), Error> {
 // the next block produced by the validator with the given public key.
 pub fn determine_graffiti(
     validator_pubkey: &PublicKeyBytes,
-    log: &slog::Logger,
     graffiti_file: Option<GraffitiFile>,
     validator_definition_graffiti: Option<Graffiti>,
     graffiti_flag: Option<Graffiti>,
 ) -> Option<Graffiti> {
+    // TODO when merging make sure logging on failure is back:
+    // warn!(log, "Failed to read graffiti file"; "error" => ?e);
     graffiti_file
-        .and_then(|mut g| match g.load_graffiti(validator_pubkey) {
-            Ok(g) => g,
-            Err(e) => {
-                warn!(log, "Failed to read graffiti file"; "error" => ?e);
-                None
-            }
-        })
+        .and_then(|mut g| g.load_graffiti(validator_pubkey).unwrap_or(None))
         .or(validator_definition_graffiti)
         .or(graffiti_flag)
 }