Add __array_ufunc__ support for ProxyObject

[galipremsagar]

Fixes: #730

This PR add __array_ufunc__ to ProxyObject

[galipremsagar]

I also don't have the permissions to set the labels on this PR, can someone add them?

[madsbk]

Nice work @galipremsagar, thanks for the fix. I only have a minor suggestion.

[codecov-commenter]

Codecov Report

Merging #731 (1398453) into branch-21.10 (8e6ab70) will decrease coverage by 26.58%.
The diff coverage is 76.36%.

❗ Current head 1398453 differs from pull request most recent head 7cea00f. Consider uploading reports for the commit 7cea00f to get more accurate results

@@                Coverage Diff                @@
##           branch-21.10     #731       +/-   ##
=================================================
- Coverage         87.63%   61.04%   -26.59%     
=================================================
  Files                15       21        +6     
  Lines              1658     2734     +1076     
=================================================
+ Hits               1453     1669      +216     
- Misses              205     1065      +860     

Impacted Files	Coverage Δ
dask_cuda/benchmarks/local_cudf_merge.py	0.00% <0.00%> (ø)
dask_cuda/benchmarks/local_cudf_shuffle.py	0.00% <0.00%> (ø)
dask_cuda/benchmarks/local_cupy.py	0.00% <0.00%> (ø)
dask_cuda/benchmarks/local_cupy_map_overlap.py	0.00% <0.00%> (ø)
dask_cuda/benchmarks/utils.py	0.00% <0.00%> (ø)
dask_cuda/cuda_worker.py	77.64% <ø> (ø)
dask_cuda/get_device_memory_objects.py	90.00% <0.00%> (+21.94%)	⬆️
dask_cuda/local_cuda_cluster.py	77.88% <50.00%> (ø)
dask_cuda/utils.py	81.74% <65.95%> (-5.53%)	⬇️
dask_cuda/proxify_device_objects.py	95.45% <80.00%> (+6.56%)	⬆️
... and 21 more

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[madsbk]

@gpucibot merge