Scan cell

[ASEM000]

Simplify scanning API

• Works for any function/serket cells with input,state->output,state signature
• Updated guides to reflect changes.

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (412e41d) 97.14% compared to head (3499890) 96.87%.

Files	Patch %	Lines
serket/_src/nn/linear.py	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #87      +/-   ##
==========================================
- Coverage   97.14%   96.87%   -0.27%     
==========================================
  Files          37       37              
  Lines        4549     4448     -101     
==========================================
- Hits         4419     4309     -110     
- Misses        130      139       +9     

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