Auto name cross sections

[joamatab]

fixes issue #2089

now it should work even without defining the name

[codecov]

Codecov Report

Merging #2119 (b154d42) into main (0db0674) will decrease coverage by 0.20%.
The diff coverage is 93.10%.

@@            Coverage Diff             @@
##             main    #2119      +/-   ##
==========================================
- Coverage   70.63%   70.44%   -0.20%     
==========================================
  Files         368      368              
  Lines       23078    23066      -12     
  Branches     3431     3431              
==========================================
- Hits        16302    16249      -53     
- Misses       5739     5778      +39     
- Partials     1037     1039       +2     

Files Changed	Coverage Δ
gdsfactory/components/bend_s.py	82.97% <ø> (ø)
gdsfactory/components/bezier.py	86.84% <ø> (ø)
gdsfactory/components/mzi.py	93.75% <ø> (ø)
gdsfactory/components/splitter_chain.py	100.00% <ø> (ø)
gdsfactory/components/straight.py	100.00% <ø> (ø)
gdsfactory/components/straight_heater_doped_rib.py	81.08% <ø> (ø)
gdsfactory/routing/all_angle.py	81.49% <ø> (ø)
gdsfactory/cross_section.py	50.09% <85.71%> (-3.98%)	⬇️
gdsfactory/components/add_trenches.py	86.66% <100.00%> (ø)
gdsfactory/components/disk.py	81.05% <100.00%> (ø)
... and 4 more

... and 5 files with indirect coverage changes

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