IR Integration plan

[justinchuby]

flowchart TD
    pattern(Rewriter pattern)  --> generic_pattern(Unify pattern classes) --> passes(Rewriter passes)
    script(Replace ONNX Script IR) --> value(Change `Op.__cal__` to return `Value`)
    script(Replace ONNX Script IR) --> dtype(Update and unify the data types)
    torchlib(Update torchlib to use IR) --> trace(Unify with ONNX Script trace mode)

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[justinchuby]

• [WIP] Use IR in onnxscript #1409
• Integrate new IR with rewriter #1395
• Use IR in ONNX Script converter #1410
• Use the new IR for building graphs in torchlib #1354
• Use IR in the optimizer #1701