Add manifest.yaml to each test vector to make metadata self-contained and test cases easier to share and verify#4712

Sandijigs wants to merge 2 commits intoethereum:masterethereum/consensus-specs:masterfrom

Sandijigs:feature/manifest_file_for_tests_vectorsSandijigs/consensus-specs:feature/manifest_file_for_tests_vectorsCopy head branch name to clipboard