A new filter that implements RFC9421 References - https://github.com/yaronf/httpsign - https://github.com/lestrrat-go/htmsig - https://github.com/dadrus/httpsig - https://github.com/common-fate/httpsig - https://www.rfc-editor.org/rfc/rfc9421 - https://github.com/curl/curl/pull/21239
