GPU support for linear filtering options.

[aewallwi]

Add support for GPU acceleration of linear filtering methods using the tensorflow library.

[codecov]

Codecov Report

Merging #139 (96326bc) into main (b1bbe5f) will decrease coverage by 0.15%.
The diff coverage is 89.31%.

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
- Coverage   87.88%   87.72%   -0.16%     
==========================================
  Files           7        7              
  Lines        1502     1581      +79     
==========================================
+ Hits         1320     1387      +67     
- Misses        182      194      +12     

Flag	Coverage Δ
unittests	87.72% <89.31%> (-0.16%)	⬇️

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Impacted Files	Coverage Δ
setup.py	0.00% <ø> (ø)
uvtools/dspec.py	96.66% <89.31%> (-1.11%)	⬇️

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