Add a new bls test (#3235)

## Issue Addressed

Which issue # does this PR address?
#2629 

## Proposed Changes

Please list or describe the changes introduced by this PR.

1. ci would dowload the bls test cases from https://github.com/ethereum/bls12-381-tests/
2. all the bls test cases(except eth ones) would use cases in the archive from step one
3. The bls test cases from https://github.com/ethereum/consensus-spec-tests would stay there and no use . For the future , these bls test cases would be remove suggested from https://github.com/ethereum/consensus-spec-tests/issues/25 . So it would do no harm and compatible for future cases.

## Additional Info

Please provide any additional information. For example, future considerations
or information useful for reviewers.


Question: 

I am not sure if I should implement tests about `deserialization_G1`, `deserialization_G2` and `hash_to_G2` for the issue.

testing/ef_tests/src/cases/bls_verify_msg.rs

@@ -1,6 +1,6 @@
 use super::*;
 use crate::case_result::compare_result;
-use crate::cases::common::BlsCase;
+use crate::impl_bls_load_case;
 use bls::{PublicKeyBytes, Signature, SignatureBytes};
 use serde_derive::Deserialize;
 use std::convert::TryInto;
@@ -19,13 +19,9 @@ pub struct BlsVerify {
     pub output: bool,
 }
 
-impl BlsCase for BlsVerify {}
+impl_bls_load_case!(BlsVerify);
 
 impl Case for BlsVerify {
-    fn is_enabled_for_fork(fork_name: ForkName) -> bool {
-        fork_name == ForkName::Base
-    }
-
     fn result(&self, _case_index: usize, _fork_name: ForkName) -> Result<(), Error> {
         let message = hex::decode(&self.input.message[2..])
             .map_err(|e| Error::FailedToParseTest(format!("{:?}", e)))?;