Dynamically create Variables classes to avoid shared state

[philippjfr]

Sharing a single class for all Variables instances caused issues because when dynamically adding parameters to an instance this would mess with other instances. Therefore we now dynamically create new Variables classes for each instance.

[codecov-commenter]

Codecov Report

Merging #413 (bbe3efe) into main (eaef7bf) will decrease coverage by 0.19%.
The diff coverage is 84.74%.

@@            Coverage Diff             @@
##             main     #413      +/-   ##
==========================================
- Coverage   68.51%   68.32%   -0.20%     
==========================================
  Files          73       73              
  Lines        8251     8419     +168     
==========================================
+ Hits         5653     5752      +99     
- Misses       2598     2667      +69     

Impacted Files	Coverage Δ
lumen/validation.py	87.50% <ø> (ø)
lumen/rest.py	24.34% <50.00%> (ø)
lumen/sources/intake_dremio.py	57.14% <50.00%> (ø)
lumen/ui/fast.py	73.33% <50.00%> (-3.53%)	⬇️
lumen/schema.py	57.41% <66.66%> (-0.20%)	⬇️
lumen/sources/base.py	63.20% <72.22%> (-0.04%)	⬇️
lumen/ui/state.py	70.83% <75.00%> (-4.78%)	⬇️
lumen/ui/views.py	41.08% <75.00%> (+0.58%)	⬆️
lumen/state.py	64.61% <77.04%> (-1.92%)	⬇️
lumen/dashboard.py	76.51% <81.57%> (-1.13%)	⬇️
... and 45 more

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[github-actions]

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