[#2] CMakeFile, Try 2, UTF-8 support works
CMakeLists.txt is now vastly simplified, and all work is delegated to ydbcmake. ydbcmake was slightly updated to set the correct location of the UTF-8 file install.
Previous commit 5f20360f did not handle installing UTF-8 file correctly.
In addition, _YDBAIMTEST.m was missed in the previous commit. It's now added.