Convert project to CMake and fix various things

• Add CMakeLists.txt
• Remove old Makefile
• Rename libcurl.xc_proto to libcurl.xc
• Copy _ut.m and _ut1.m from YDBSodium to fix compilation issue.
• Fix various test issues in libcurlPluginTests.m
  • Fix TCERT2 with adding copy_extension option to openssl req
  • Fix THGET to make it work on both Ubuntu/Debian and Rocky. Previously, It was using etag: as and header result assertion which not working with Rocky (Rocky header is Etag:). So, we changed to tag: instead.
• Fix README.md