Multi gpu support

[haesleinhuepf]

With this change, one can run code on multiple GPUs in parallel.

[codecov-commenter]

Codecov Report

Merging #129 (9450673) into multi_gpu_support (090440a) will increase coverage by 0.09%.
The diff coverage is 94.97%.

@@                  Coverage Diff                  @@
##           multi_gpu_support     #129      +/-   ##
=====================================================
+ Coverage              91.54%   91.63%   +0.09%     
=====================================================
  Files                    514      517       +3     
  Lines                   9162     9290     +128     
=====================================================
+ Hits                    8387     8513     +126     
- Misses                   775      777       +2     

Impacted Files	Coverage Δ
pyclesperanto_prototype/_tier0/_execute.py	63.04% <ø> (ø)
pyclesperanto_prototype/_tier0/_create.py	84.21% <83.67%> (+0.51%)	⬆️
...anto_prototype/_tier1/_execute_separable_kernel.py	94.59% <84.61%> (+5.70%)	⬆️
pyclesperanto_prototype/_tier0/__init__.py	100.00% <100.00%> (ø)
pyclesperanto_prototype/_tier0/_device.py	80.28% <100.00%> (+8.40%)	⬆️
pyclesperanto_prototype/_tier0/_plugin_function.py	100.00% <100.00%> (ø)
pyclesperanto_prototype/_tier0/_push.py	94.44% <100.00%> (+1.11%)	⬆️
pyclesperanto_prototype/_tier0/_pycl.py	84.85% <100.00%> (-2.87%)	⬇️
pyclesperanto_prototype/_tier0/_utils.py	100.00% <100.00%> (ø)
pyclesperanto_prototype/_tier1/_copy.py	100.00% <100.00%> (ø)
... and 9 more

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