add OracleGate class and its metaclass

Provide customize_gate as user-function to customize QuantumGate and integrate into QuantumCircuit

src/quafu/circuits/quantum_circuit.py

@@ -56,7 +56,7 @@ def parameterized_gates(self):
 
     @property
     def num(self):
-        return np.sum([len(qreg) for qreg in self.qregs])
+        return sum([len(qreg) for qreg in self.qregs])
 
     @property
     def used_qubits(self) -> List:
@@ -428,10 +428,9 @@ def wrap_to_gate(self, name: str):
         Wrap the circuit to a subclass of QuantumGate, create by metaclass.
         """
         # TODO: error check
-        from instruction.qu_gate.quantum_gate import customize_gate
-        customized = customize_gate(cls_name=name.capitalize(),
-                                    sd_name=name,
-                                    qubit_num=self.qbit_num,
+        from quafu.elements.quantum_element.quantum_gate import customize_gate
+        customized = customize_gate(cls_name=name.lower(),
+                                    qubit_num=self.num,
                                     gate_structure=self.gates)
         return customized
 

src/quafu/elements/quantum_element/quantum_gate.py

@@ -1,3 +1,17 @@
+# (C) Copyright 2023 Beijing Academy of Quantum Information Sciences
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from abc import ABC, abstractmethod, ABCMeta
 from typing import List, Union, Iterable