archivers/zstd: Add CMake config files and adjust Makefile

• Use upstream's short test for "make test"
• Use verbose output by default during build
• Tweak Makefile to follow Porters Handbook more closely
• Install CMake files (taken from CMake build framework)

PR: 267652
Reported by: fluffy
Approved by: portmgr (maintainer timeout, 1+ month)