[1/N] Make the execution environment adapter agnostic

-Create a structure for adapter specific data
-Store an array of adapter data in the execution environment

Related-To: NEO-3857

Change-Id: Ia5b52a7bfa53198f0ca5124bcaa0669dd3601faf
Signed-off-by: Jobczyk, Lukasz <lukasz.jobczyk@intel.com>

unit_tests/execution_environment/execution_environment_tests.cpp

@@ -189,6 +189,7 @@ TEST(ExecutionEnvironment, givenExecutionEnvironmentWhenInitializeMemoryManagerI
 static_assert(sizeof(ExecutionEnvironment) == sizeof(std::vector<std::unique_ptr<CommandStreamReceiver>>) +
                                                   sizeof(std::mutex) +
                                                   sizeof(std::unique_ptr<HardwareInfo>) +
+                                                  sizeof(std::unique_ptr<RootDeviceEnvironment[]>) +
                                                   (is64bit ? 88 : 48),
               "New members detected in ExecutionEnvironment, please ensure that destruction sequence of objects is correct");