add optional function add_bbox to bend_euler and bend_circular

[joamatab]

No description provided.

[codecov]

Codecov Report

Merging #2202 (abd4174) into main (0190612) will increase coverage by 73.08%.
Report is 2 commits behind head on main.
The diff coverage is 42.85%.

@@            Coverage Diff            @@
##           main    #2202       +/-   ##
=========================================
+ Coverage      0   73.08%   +73.08%     
=========================================
  Files         0      368      +368     
  Lines         0    22979    +22979     
  Branches      0     3391     +3391     
=========================================
+ Hits          0    16795    +16795     
- Misses        0     5100     +5100     
- Partials      0     1084     +1084     

Files	Coverage Δ
gdsfactory/components/straight.py	92.00% <100.00%> (ø)
gdsfactory/components/bend_circular.py	93.93% <33.33%> (ø)
gdsfactory/components/bend_euler.py	70.78% <33.33%> (ø)

... and 365 files with indirect coverage changes

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