Create a C++ verify executable

 - CLI - ./verify --test_desc JSON_CONFIG_PATH --imp_result_file IMP_PATH
 --ref_result_file REF_PATH [--bnd_result_file BND_PATH] [--ofm_name OFM_NAME]
 - Changes to compliance metadata in json_config to include shape information
 - verify_relative and verify_reduce_product changed due to #include error
 - unit_tests added to reference_model/test/verify_exe_testing.cpp

Signed-off-by: Emmanuel Adesola <emmanuel.adesola@arm.com>
Change-Id: I13ed2e173b82cf148a556c99d49fd106a8e64882