Device management

[StRigaud]

Attempt to improve backend code for device and ressources management with OpenCL.

Objectives are:

• improve device switch
• improve code structure
• enquiry/solve memory issue when running with dask

Closes clEsperanto/pyclesperanto#283
Closes #387

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 51.90476% with 101 lines in your changes missing coverage. Please review.

Project coverage is 46.65%. Comparing base (5c32a1a) to head (d712c88).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
clic/src/opencldevice.cpp	56.92%	14 Missing and 42 partials ⚠️
clic/src/openclbackend.cpp	44.73%	11 Missing and 31 partials ⚠️
clic/src/array.cpp	25.00%	0 Missing and 3 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #399      +/-   ##
==========================================
+ Coverage   46.54%   46.65%   +0.11%     
==========================================
  Files         199      199              
  Lines        3848     3967     +119     
  Branches     1767     1810      +43     
==========================================
+ Hits         1791     1851      +60     
- Misses        692      715      +23     
- Partials     1365     1401      +36     

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[StRigaud]

After a local tests, this PR solve the memory issue when using dask with multi-gpu