Add copyright pre-commit-hook (#1742)

* first commit

* Add copyright pre-commit-hook

tests/test_ops/test_cc_attention.py

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

tests/test_ops/test_contour_expand.py

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

tests/test_ops/test_convex_iou.py

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

tests/test_ops/test_corner_pool.py

+# Copyright (c) OpenMMLab. All rights reserved.
 """
 CommandLine:
     pytest tests/test_corner_pool.py

tests/test_ops/test_deform_conv.py

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

tests/test_ops/test_deform_roi_pool.py

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

tests/test_ops/test_focal_loss.py

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

tests/test_ops/test_furthest_point_sample.py

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

tests/test_ops/test_fused_bias_leakyrelu.py

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

tests/test_ops/test_gather_points.py

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

tests/test_ops/test_group_points.py

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

tests/test_ops/test_info.py

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

tests/test_ops/test_iou3d.py

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

tests/test_ops/test_knn.py

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

tests/test_ops/test_masked_conv2d.py

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

tests/test_ops/test_merge_cells.py

+# Copyright (c) OpenMMLab. All rights reserved.
 """
 CommandLine:
     pytest tests/test_merge_cells.py

tests/test_ops/test_min_area_polygons.py

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

tests/test_ops/test_modulated_deform_conv.py

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

tests/test_ops/test_ms_deformable_attn.py

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

tests/test_ops/test_nms.py

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