Disable all floating-point comparisons during validation

[ml-evs]

Closes #735 by disabling floating point comparisons for float fields, and for fields that are inferred to be lists of floats.

[codecov]

Codecov Report

Merging #736 (0289cbe) into master (f77235d) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #736      +/-   ##
==========================================
- Coverage   92.79%   92.78%   -0.02%     
==========================================
  Files          67       67              
  Lines        3526     3533       +7     
==========================================
+ Hits         3272     3278       +6     
- Misses        254      255       +1     

Flag	Coverage Δ
project	92.78% <100.00%> (-0.02%)	⬇️
validator	63.62% <100.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
optimade/validator/config.py	100.00% <ø> (ø)
optimade/validator/validator.py	82.36% <100.00%> (+0.04%)	⬆️

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[CasperWA]

Thanks @ml-evs !

I only have a very minor insignificant suggested change - it can be ignored or kept as you see fit.