Add kzg trusted setup file cli param and load into beacon chain

beacon_node/src/cli.rs

@@ -511,6 +511,17 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
                 .default_value("1")
                 .takes_value(true)
         )
+        /* 4844 settings */
+        .arg(
+            Arg::with_name("trusted-setup-file")
+                .long("trusted-setup-file")
+                .value_name("FILE")
+                .help("File containing the trusted setup parameters. \
+                      NOTE: This is only for the devnet, the trusted setup params \
+                      must be embedded into the ethspec once parameter loading \
+                      is supported in the ckzg library")
+                .takes_value(true)
+        )
         /*
          * Database purging and compaction.
          */

beacon_node/src/config.rs

@@ -360,6 +360,11 @@ pub fn get_config<E: EthSpec>(
         client_config.execution_layer = Some(el_config);
     }
 
+    // 4844 params
+    if let Some(trusted_setup_file) = cli_args.value_of("trusted-setup-file") {
+        client_config.trusted_setup_file = Some(PathBuf::from(trusted_setup_file));
+    }
+
     if let Some(freezer_dir) = cli_args.value_of("freezer-dir") {
         client_config.freezer_db_path = Some(PathBuf::from(freezer_dir));
     }