add round_corners_east_west and round_corners_north_south to rectangle

[joamatab]

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[codecov]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (f3edf0c) 72.67% compared to head (aea1e80) 72.61%.
Report is 6 commits behind head on main.

Files	Patch %	Lines
gdsfactory/components/rectangle.py	13.04%	16 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2349      +/-   ##
==========================================
- Coverage   72.67%   72.61%   -0.07%     
==========================================
  Files         369      369              
  Lines       23131    23153      +22     
  Branches     3735     3739       +4     
==========================================
+ Hits        16811    16813       +2     
- Misses       5218     5234      +16     
- Partials     1102     1106       +4     

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