Add valueinfos field to FunctionProto

[gramalingam]

Description

• Extend FunctionProto by adding a field to store ValueInfos for variables in the function.
• Extend the helper function and parser to support this.

Motivation and Context

This enables type/shape information to be stored for variables in a FunctionProto, just like in a GraphProto. Note that this is optional, just like in a graph. This field may store type/shape info for the inputs and outputs of a function as well. (Note that, unlike in a graph, the input/output field in a FunctionProto do not have explicit types/shapes, they are just strings, not ValueInfo.)

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (3d976ff) 56.65% compared to head (98e9392) 56.65%.

Files	Patch %	Lines
onnx/helper.py	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5903   +/-   ##
=======================================
  Coverage   56.65%   56.65%           
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  Files         506      506           
  Lines       30193    30196    +3     
  Branches     4555     4556    +1     
=======================================
+ Hits        17105    17107    +2     
  Misses      12266    12266           
- Partials      822      823    +1     

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