Clippy clean (#536)

* Change into_iter to iter

* Fix clippy 'easy' warnings

* Clippy eth2/utils

* Add struct NetworkInfo

* Clippy for types, utils, and beacon_node/store/src/iters.rs

* Cargo fmt

* Change foo to my_foo

* Remove complex signature

* suppress clippy warning for unit_value in benches

* Use enumerate instead of iterating over range

* Allow trivially_copy_pass_by_ref in serde_utils

eth2/state_processing/benches/benches.rs

@@ -71,6 +71,7 @@ fn get_worst_block<T: EthSpec>(
     builder.build(&spec)
 }
 
+#[allow(clippy::unit_arg)]
 fn bench_block<T: EthSpec>(
     c: &mut Criterion,
     block: BeaconBlock<T>,