Add shared-memory GPU implementations of spreading and interpolation

[jipolanco]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 91.60584% with 23 lines in your changes missing coverage. Please review.

Project coverage is 92.35%. Comparing base (c8b7aa6) to head (c9311e0).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/spreading/gpu.jl	86.25%	18 Missing ⚠️
src/interpolation/gpu.jl	96.11%	4 Missing ⚠️
src/blocking.jl	96.55%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
- Coverage   92.88%   92.35%   -0.54%     
==========================================
  Files          17       17              
  Lines        1405     1608     +203     
==========================================
+ Hits         1305     1485     +180     
- Misses        100      123      +23     

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