fix subgraph bug

[xiaowuhu]

• When convert onnx model from fp32 to fp16, the previous process didn't distinguish global graph(model.graph) with sub-graph such as the elseGraph and thenGraph in If op's attribute, so the new Cast op was added into global graph, but it should be insinde the sub-graph.
• After added Cast op, the order of all the ops should be re-sort, in order that the ORT can inference it correctly. Before this PR, the resort need using other tools to do, not friendly to end user.
• add pyproject.toml, because setup.py was deprecated and cannot be used any longer since last week

[fatcat-z]

Please fix the CI failures.

[eofom]

Convert from coreml calls this with target_type being FloatTensorType(shape=[]), which is not a type, resulting in
TypeError: isinstance() arg 2 must be a type, a tuple of types, or a union

Writing here because the old version would have worked

Python 3.10.13
onnxconverter_common.version 1.14.0
onnxmltools.version 1.12.0
onnx.version 1.15.0
coremltools.version 7.1