Alter API error messages to be more structured

[realsuayip]

No description provided.

[codecov-commenter]

Codecov Report

Merging #43 (12213fa) into main (e09e869) will decrease coverage by 0.02%.
The diff coverage is 97.36%.

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@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   97.96%   97.95%   -0.02%     
==========================================
  Files          80       80              
  Lines        3492     3516      +24     
==========================================
+ Hits         3421     3444      +23     
- Misses         71       72       +1     

Files Changed	Coverage Δ
tests/test_auth.py	100.00% <ø> (ø)
asu/utils/rest.py	95.55% <95.65%> (-0.55%)	⬇️
asu/auth/schemas.py	80.39% <100.00%> (ø)
asu/utils/openapi.py	82.35% <100.00%> (+2.35%)	⬆️
asu/verification/email/schemas.py	100.00% <100.00%> (ø)
asu/verification/password/schemas.py	100.00% <100.00%> (ø)
asu/verification/registration/schemas.py	100.00% <100.00%> (ø)
tests/test_utils.py	95.86% <100.00%> (+0.27%)	⬆️