Add copyright pre-commit-hook (#1742)

* first commit

* Add copyright pre-commit-hook

tests/test_ops/test_nms_rotated.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import numpy as np
 import pytest
 import torch

tests/test_ops/test_onnx.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import os
 import warnings
 from functools import partial

tests/test_ops/test_pixel_group.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import numpy as np
 import torch
 

tests/test_ops/test_points_in_polygons.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import numpy as np
 import pytest
 import torch

tests/test_ops/test_psa_mask.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import numpy as np
 import torch
 import torch.nn as nn

tests/test_ops/test_riroi_align_rotated.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import numpy as np
 import pytest
 import torch

tests/test_ops/test_roi_align.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import numpy as np
 import pytest
 import torch

tests/test_ops/test_roi_align_rotated.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import numpy as np
 import pytest
 import torch

tests/test_ops/test_roi_pool.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import os
 
 import numpy as np

tests/test_ops/test_roipoint_pool3d.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import pytest
 import torch
 

tests/test_ops/test_rotated_feature_align.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import pytest
 import torch
 

tests/test_ops/test_saconv.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import torch
 import torch.nn as nn
 

tests/test_ops/test_scatter_points.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import pytest
 import torch
 from torch.autograd import gradcheck

tests/test_ops/test_spconv.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import pytest
 import torch
 from torch import nn

tests/test_ops/test_syncbn.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import os
 import platform
 

tests/test_ops/test_tensorrt.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import os
 from functools import partial
 from typing import Callable

tests/test_ops/test_tensorrt_preprocess.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import os
 from functools import wraps
 

tests/test_ops/test_three_interpolate.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import pytest
 import torch
 

tests/test_ops/test_three_nn.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import pytest
 import torch
 

tests/test_ops/test_tin_shift.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import os
 
 import numpy as np