Fix clippy warnings (#1385)

## Issue Addressed

NA

## Proposed Changes

Fixes most clippy warnings and ignores the rest of them, see issue #1388.

beacon_node/store/src/forwards_iter.rs

@@ -78,7 +78,7 @@ impl SimpleForwardsBlockRootsIterator {
                     .collect::<Vec<_>>()
             },
         )?;
-        Ok(Self { values: values })
+        Ok(Self { values })
     }
 }