Some Shape Related Fusions (#19832)
This PR adds below shape related fusions, which is helpful for some
transformer models:
- ShapeInputMerge is to merge all Shape nodes' input NodeArg to a single
one (the 1st one on topo order) if they have the same shape value. This
helps CSE fusion to merge more nodes.
- CSE fusion to support scalar tensor as attribute value. This is mainly
to support ConstantOfShape node.
