serialize layer by name

[joamatab]

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[sourcery-ai]

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 68.25%. Comparing base (7ade799) to head (d175161).
Report is 4 commits behind head on main.

Files	Patch %	Lines
gdsfactory/serialization.py	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2813      +/-   ##
==========================================
- Coverage   68.26%   68.25%   -0.01%     
==========================================
  Files         300      300              
  Lines       15594    15597       +3     
  Branches     2276     2277       +1     
==========================================
+ Hits        10645    10646       +1     
- Misses       4355     4356       +1     
- Partials      594      595       +1     

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