feat(netlists): consistent Spectre/Spice netlist API

[rahulk29]

fix(schemas): consistent use of optional sized bound for schemas
fix(docs): update docs, import trait in tests

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (c85d043) 39.38% compared to head (76a010f) 39.38%.

Files	Patch %	Lines
substrate/src/error.rs	0.00%	3 Missing ⚠️
tools/spectre/src/lib.rs	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #349      +/-   ##
==========================================
- Coverage   39.38%   39.38%   -0.01%     
==========================================
  Files         162      162              
  Lines       20008    20014       +6     
  Branches     8388     8387       -1     
==========================================
+ Hits         7880     7882       +2     
- Misses       6650     6653       +3     
- Partials     5478     5479       +1     

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