Add json measurement output option and generic TDX attestation type to make CLI similar to cvm-reverse-proxy#142

ameba23 merged 3 commits intomainflashbots/attested-tls-proxy:mainfrom

peg/fixes-for-get-tls-certflashbots/attested-tls-proxy:peg/fixes-for-get-tls-certCopy head branch name to clipboard