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/src/per_block_processing.rs

@@ -59,8 +59,8 @@ pub enum VerifySignatures {
 }
 
 impl VerifySignatures {
-    pub fn is_true(&self) -> bool {
-        *self == VerifySignatures::True
+    pub fn is_true(self) -> bool {
+        self == VerifySignatures::True
     }
 }