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/utils/ssz/examples/large_list.rs

@@ -8,7 +8,6 @@ fn main() {
     let vec: Vec<u64> = vec![4242; 8196];
 
     let output: Vec<Vec<u64>> = (0..40_000)
-        .into_iter()
         .map(|_| Vec::from_ssz_bytes(&vec.as_ssz_bytes()).unwrap())
         .collect();