Manually implement deserialize

[pawanjay176]

Enforce length constraints after serde deserializing. Add tests

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 57.24%. Comparing base (b7f47d9) to head (a4ab654).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/fixed_vector.rs	80.00%	2 Missing ⚠️
src/variable_list.rs	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   55.55%   57.24%   +1.68%     
==========================================
  Files           8        8              
  Lines         270      290      +20     
==========================================
+ Hits          150      166      +16     
- Misses        120      124       +4     

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[michaelsproul]

Beautiful. Not sure why the code coverage tool is complaining about that PhantomData line or the format string. I suspect both are optimised out, which is fine.