static ClientAuthentication ofBasic(String authorization) {
        requireNonNull(authorization, "authorization");
        return ofAuthorization("Basic", authorization);
    }
Returns a {@link ClientAuthentication} for the OAuth 2.0 requests based on encoded HTTP basic
authorization token, as per <a href="https://datatracker.ietf.org/doc/html/rfc6749#section-2.3">[RFC6749], Section 2.3</a>.

@param authorization A client authorization token.
oauth2/src/main/java/com/linecorp/armeria/common/auth/oauth2/ClientAuthentication.java