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build: Add cmake files for building the tests

Description

build: Add cmake files for building the tests

* CMakeLists.txt: Add subdirectory tests to the build.
* cmake/modules/G10CMakeSettings.cmake: Add option BUILD_TESTING.
* tests/CMakeLists.txt: New.
* tests/Makefile.am: Remove.
* tests/README: Update.

This change adds support for building and running the test/example
programs.