First version of GraphBuilder

[gramalingam]

First version of GraphBuilder

[codecov]

Codecov Report

❌ Patch coverage is 87.61905% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.84%. Comparing base (d83d50b) to head (c771c71).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
onnxscript/_internal/builder.py	73.93%	34 Missing and 15 partials ⚠️
onnxscript/_internal/_inference.py	79.24%	5 Missing and 6 partials ⚠️
onnxscript/_internal/builder_test.py	98.23%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2814      +/-   ##
==========================================
+ Coverage   70.52%   70.84%   +0.32%     
==========================================
  Files         228      231       +3     
  Lines       27135    27660     +525     
  Branches     2727     2775      +48     
==========================================
+ Hits        19137    19597     +460     
- Misses       7065     7106      +41     
- Partials      933      957      +24     

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