Add mmi mxn

[joamatab]

No description provided.

[codecov]

Codecov Report

Merging #1915 (bda7b18) into main (8d33a28) will increase coverage by 0.01%.
Report is 4 commits behind head on main.
The diff coverage is 81.03%.

@@            Coverage Diff             @@
##             main    #1915      +/-   ##
==========================================
+ Coverage   68.89%   68.91%   +0.01%     
==========================================
  Files         377      378       +1     
  Lines       23968    24017      +49     
  Branches     3510     3521      +11     
==========================================
+ Hits        16513    16551      +38     
- Misses       6451     6456       +5     
- Partials     1004     1010       +6     

Files Changed	Coverage Δ
gdsfactory/components/mmi.py	77.08% <77.08%> (ø)
gdsfactory/components/__init__.py	100.00% <100.00%> (ø)
gdsfactory/components/mmi1x2.py	87.17% <100.00%> (ø)
gdsfactory/components/mmi2x2.py	76.31% <100.00%> (ø)

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