Remove compare_fields and import from crates.io (#8189)

Use the recently published `compare_fields` and remove it from Lighthouse
https://crates.io/crates/compare_fields


Co-Authored-By: Mac L <mjladson@pm.me>

testing/ef_tests/src/cases/rewards.rs

@@ -1,7 +1,7 @@
 use super::*;
 use crate::case_result::compare_result_detailed;
 use crate::decode::{ssz_decode_file, ssz_decode_state, yaml_decode_file};
-use compare_fields_derive::CompareFields;
+use compare_fields::CompareFields;
 use serde::Deserialize;
 use ssz::four_byte_option_impl;
 use ssz_derive::{Decode, Encode};