Consolidate error types

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 79.59184% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.58%. Comparing base (593ff43) to head (57dc4af).

Files with missing lines	Patch %	Lines
crates/val-wasm/src/lib.rs	0.00%	6 Missing ⚠️
src/error.rs	88.23%	2 Missing ⚠️
src/value.rs	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   78.45%   78.58%   +0.12%     
==========================================
  Files          29       28       -1     
  Lines        3514     3507       -7     
==========================================
- Hits         2757     2756       -1     
+ Misses        757      751       -6     

Flag	Coverage Δ
unit	78.58% <79.59%> (+0.12%)	⬆️

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