flat_routing option in OpenFPGA script EDA-3138

[serge-dsa]

Motivate of the pull request

• [ X] To address an existing issue. If so, please provide a link to the issue:

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 14.79%. Comparing base (430c1d9) to head (cd713b6).

Files with missing lines	Patch %	Lines
src/Compiler/CompilerOpenFPGA.cpp	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1688      +/-   ##
==========================================
- Coverage   14.79%   14.79%   -0.01%     
==========================================
  Files         480      480              
  Lines       63889    63892       +3     
  Branches    26128    26183      +55     
==========================================
  Hits         9451     9451              
- Misses      53191    53213      +22     
+ Partials     1247     1228      -19     

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