Make errors lazier

[samuelcolvin]

wip

[codecov]

Codecov Report

Merging #27 (9f38b37) into main (2fedd6c) will increase coverage by 3.38%.
The diff coverage is 66.33%.

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   64.64%   68.02%   +3.38%     
==========================================
  Files          22       22              
  Lines        1612     1648      +36     
==========================================
+ Hits         1042     1121      +79     
+ Misses        570      527      -43     

Impacted Files	Coverage Δ
src/errors/kinds.rs	100.00% <ø> (ø)
src/errors/val_error.rs	0.00% <0.00%> (ø)
src/lib.rs	100.00% <ø> (ø)
src/validators/float.rs	11.76% <8.33%> (+0.54%)	⬆️
src/validators/int.rs	33.33% <18.75%> (ø)
src/input/json.rs	44.97% <27.41%> (+0.88%)	⬆️
src/input/python.rs	66.27% <53.65%> (+2.64%)	⬆️
src/validators/list.rs	60.31% <66.66%> (+2.50%)	⬆️
src/validators/union.rs	75.00% <66.66%> (ø)
src/validators/string.rs	83.20% <72.72%> (-0.38%)	⬇️
... and 17 more

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