Enable CMake to search the new package variable <PackageName>_ROOT (#975)
Enable CMake to search the new package variable <PackageName>_ROOT (#975)

* Enable CMake to search the new package variable <PackageName>_ROOT

* CMake format
open-telemetry/opentelemetry-cpp,open-telemetry/opentelemetry-cpp,open-telemetry/opentelemetry-cpp,open-telemetry/opentelemetry-cpp