add pins and flatten_invalid_refs

[joamatab]

• flatten_invalid_refs = True by default
• strip has pins of 1nm to check connectivity checks
• all angle router width wide = 0.9 to match with_wide

[codecov]

Codecov Report

Merging #1674 (ea2e289) into main (c62f3ec) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1674      +/-   ##
==========================================
+ Coverage   68.40%   68.46%   +0.06%     
==========================================
  Files         377      377              
  Lines       23287    23287              
  Branches     3401     3401              
==========================================
+ Hits        15929    15943      +14     
+ Misses       6414     6400      -14     
  Partials      944      944              

Impacted Files	Coverage Δ
gdsfactory/components/mzi.py	93.82% <ø> (ø)
gdsfactory/pdk.py	57.01% <ø> (ø)
gdsfactory/routing/all_angle.py	83.59% <ø> (ø)
gdsfactory/component.py	62.18% <100.00%> (-0.19%)	⬇️
gdsfactory/cross_section.py	53.63% <100.00%> (ø)

... and 16 files with indirect coverage changes

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