allow custom import gds

[joamatab]

fixes #1547

it requires custom import_gds to be like this

@gf.cell(autoname=False, copy_if_cached=False)
def import_gds_custom(gdspath, **kwargs):
    return gf.import_gds(gdspath, **kwargs)

@tvt173
@friederike-joehlinger-wavephotonics
@FJohlinger

[sourcery-ai]

Hey @joamatab - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟡 Testing: 3 issues found
• 🟢 Complexity: all looks good
• 🟢 Docstrings: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.77%. Comparing base (ffdff4f) to head (39251b8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2661      +/-   ##
==========================================
- Coverage   71.77%   71.77%   -0.01%     
==========================================
  Files         366      366              
  Lines       23756    23757       +1     
  Branches     3874     3874              
==========================================
  Hits        17052    17052              
- Misses       5578     5580       +2     
+ Partials     1126     1125       -1     

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