Added Bitshift Operator

Context

See : aidge_quantization#35 (closed)

include/aidge/backend/cpu/operator/BitShiftImpl.hpp

+/********************************************************************************
+ * Copyright (c) 2023 CEA-List
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ ********************************************************************************/
+
+#ifndef AIDGE_CPU_OPERATOR_BITSHIFTIMPL_H_
+#define AIDGE_CPU_OPERATOR_BITSHIFTIMPL_H_
+
+#include "aidge/backend/OperatorImpl.hpp"
+#include "aidge/operator/BitShift.hpp"
+#include "aidge/utils/Registrar.hpp"
+#include "aidge/utils/Types.h"
+#include "aidge/backend/cpu/data/GetCPUPtr.h"
+#include <memory>
+#include <vector>
+
+namespace Aidge {
+// class BitShift_Op;
+
+// compute kernel registry for forward and backward
+class BitShiftImplForward_cpu
+    : public Registrable<BitShiftImplForward_cpu, std::tuple<DataType, DataType, DataType>, void(const Direction,const std::vector<std::size_t>&, const std::vector<std::size_t>&, const std::vector<std::size_t>&, const void*, const void*,void*)> {
+};
+class BitShiftImplBackward_cpu
+    : public Registrable<BitShiftImplBackward_cpu, std::tuple<DataType, DataType, DataType>, void(const Direction,const std::vector<std::size_t>&, const std::vector<std::size_t>&, const std::vector<std::size_t>&, const void*, const void*, void*)> {
+};
+
+class BitShiftImpl_cpu : public OperatorImpl {
+public:
+    BitShiftImpl_cpu(const BitShift_Op& op) : OperatorImpl(op, "cpu") {}
+
+    static std::unique_ptr<BitShiftImpl_cpu> create(const BitShift_Op& op) {
+        return std::make_unique<BitShiftImpl_cpu>(op);
+    }
+
+    Elts_t getNbRequiredProtected(const IOIndex_t inputIdx) const override final;
+    void forward() override;
+};
+
+namespace {
+static Registrar<BitShift_Op> registrarBitShiftImpl_cpu("cpu", Aidge::BitShiftImpl_cpu::create);
+}
+}  // namespace Aidge
+
+#endif /* AIDGE_CPU_OPERATOR_BITSHIFTIMPL_H_ */