EST Lightweight Operations

This document defines eight new operations for the Enrollment over Secure Transport (EST) protocol specified in RFC 7030: ucacaps, ucacert, ucacerts, ucrlinfo, ucrl, usimpleenroll, usimplereenroll, and userverkeygen. These operations deliver PKI objects, including CA certificates, certificate chains, CRLs, and enrolled certificates, as Base64-encoded DER or PEM, without the CMS encapsulation used by the corresponding EST operations in RFC 7030. The ucacaps operation enables EST clients to discover which operations the EST server supports. Eliminating the CMS wrapper for these responses reduces code size and parsing complexity. This document updates RFC 7030.