Merge devnet 3 (#2859)

## Issue Addressed

N/A

## Proposed Changes

Changes required for the `merge-devnet-3`. Added some more non substantive renames on top of @realbigsean 's commit. 
Note: this doesn't include the proposer boosting changes in kintsugi v3.

This devnet isn't running with the proposer boosting fork choice changes so if we are looking to merge https://github.com/sigp/lighthouse/pull/2822 into `unstable`, then I think we should just maintain this branch for the devnet temporarily. 


Co-authored-by: realbigsean <seananderson33@gmail.com>
Co-authored-by: Paul Hauner <paul@paulhauner.com>

beacon_node/client/src/builder.rs

@@ -152,7 +152,7 @@ where
             let context = runtime_context.service_context("exec".into());
             let execution_layer = ExecutionLayer::from_urls(
                 execution_endpoints,
-                config.fee_recipient,
+                config.suggested_fee_recipient,
                 context.executor.clone(),
                 context.log().clone(),
             )

beacon_node/client/src/config.rs

@@ -75,7 +75,7 @@ pub struct Config {
     pub chain: beacon_chain::ChainConfig,
     pub eth1: eth1::Config,
     pub execution_endpoints: Option<Vec<SensitiveUrl>>,
-    pub fee_recipient: Option<Address>,
+    pub suggested_fee_recipient: Option<Address>,
     pub http_api: http_api::Config,
     pub http_metrics: http_metrics::Config,
     pub monitoring_api: Option<monitoring_api::Config>,
@@ -97,7 +97,7 @@ impl Default for Config {
             sync_eth1_chain: false,
             eth1: <_>::default(),
             execution_endpoints: None,
-            fee_recipient: None,
+            suggested_fee_recipient: None,
             disabled_forks: Vec::new(),
             graffiti: Graffiti::default(),
             http_api: <_>::default(),