Implement MLGO module

* Implement MLGOHeuristics which provides a query and a loading
  interface

* Implement a top-down parser MLGOParser for parsing dotmlgo

* Add validation tests for MLGOHeuristics

Resolves COMPMID-3840, COMPMID-3841
Signed-off-by: SiCong Li <sicong.li@arm.com>
Change-Id: Iae96d2779524b2dd83623d1a3a30ef57823ae084
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4941
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/runtime/CL/mlgo/Utils.h b/src/runtime/CL/mlgo/Utils.h
new file mode 100644
index 0000000..2e324dd
--- /dev/null
+++ b/src/runtime/CL/mlgo/Utils.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2021 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef SRC_MLGO_UTILS_H
+#define SRC_MLGO_UTILS_H
+
+#include "src/runtime/CL/mlgo/Common.h"
+#include "src/runtime/CL/mlgo/HeuristicTree.h"
+#include "src/runtime/CL/mlgo/MLGOParser.h"
+
+#include <ostream>
+
+namespace arm_compute
+{
+namespace mlgo
+{
+std::ostream &operator<<(std::ostream &os, const GEMMConfigNative &config);
+std::ostream &operator<<(std::ostream &os, const GEMMConfigReshapedOnlyRHS &config);
+std::ostream &operator<<(std::ostream &os, const GEMMConfigReshaped &config);
+std::ostream &operator<<(std::ostream &os, const HeuristicType &ht);
+std::ostream &operator<<(std::ostream &os, const DataType &dt);
+std::ostream &operator<<(std::ostream &os, const HeuristicTree::Index &index);
+namespace parser
+{
+std::ostream &operator<<(std::ostream &os, CharPosition tok);
+} // namespace parser
+} // namespace mlgo
+} // namespace arm_compute
+
+#endif //SRC_MLGO_UTILS_H
\ No newline at end of file