[DRAFT] Refactor ort specific fusions

[gramalingam]

Continue cleanup of both ORT-specific fusions and function-rewrite-rules.

• Function rewrite-rules are deprecated and will be removed soon.
• ORT-specific fusions are being moved into the ort_fusions folder.
• The onnxruntime folder is retained for now primarily to assist in a few rules that remain to be written.

[codecov]

❌ 41 Tests Failed:

Tests completed	Failed	Passed	Skipped
5856	41	5815	2765

View the top 3 failed tests by shortest run time

::onnxscript.rewriter.onnxruntime.group_normalization_merge_silu_test

Stack Traces | 0s run time

ImportError while importing test module '.../rewriter/onnxruntime/group_normalization_merge_silu_test.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
.../Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
.../rewriter/onnxruntime/group_normalization_merge_silu_test.py:9: in <module>
    from onnxscript.rewriter.onnxruntime import (
E   ImportError: cannot import name 'instance_to_group_normalization' from 'onnxscript.rewriter.onnxruntime' (.../rewriter/onnxruntime/__init__.py)

onnxscript.backend.onnx_export_test.TestOnnxBackEnd::test_export2python_produces_correct_onnx_script_model_0665_test_mod_mixed_sign_float16

Stack Traces | 0.003s run time

onnxscript\backend\onnx_export_test.py:137: in extract_functions
    mod = importlib.import_module(import_name)
C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\importlib\__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
E   ModuleNotFoundError: No module named 'tests.onnx_backend_test_code.test_mod_mixed_sign_float16'

The above exception was the direct cause of the following exception:
.nox\test\lib\site-packages\parameterized\parameterized.py:620: in standalone_func
    return func(*(a + p.args), **p.kwargs, **kw)
onnxscript\backend\onnx_export_test.py:271: in test_export2python_produces_correct_onnx_script_model
    functions = extract_functions(backend_test.name, code, self.test_folder)
onnxscript\backend\onnx_export_test.py:139: in extract_functions
    raise AssertionError(
E   AssertionError: Unable to import 'tests.onnx_backend_test_code.test_mod_mixed_sign_float16' (e=No module named 'tests.onnx_backend_test_code.test_mod_mixed_sign_float16') (file: 'D:\\a\\onnxscript\\onnxscript\\tests\\onnx_backend_test_code\\test_mod_mixed_sign_float16.py', absolute path: 'D:\\a\\onnxscript\\onnxscript\\tests\\onnx_backend_test_code\\test_mod_mixed_sign_float16.py', current folder: D:\a\onnxscript\onnxscript
E   ---- CONTENT --
E   import numpy
E   from onnx import TensorProto
E   from onnx.helper import make_tensor
E   from onnxscript import script, external_tensor
E   from onnxscript.values import Opset
E   from onnxscript.onnx_types import FLOAT16
E   from onnxscript.onnx_opset import opset13
E   
E   @script()
E   def bck_test_mod_mixed_sign_float16(x: FLOAT16[6], y: FLOAT16[6]) -> (FLOAT16[6]):
E       z = opset13.Mod(x, y, fmod=1)
E       return z

onnxscript.backend.onnx_export_test.TestOnnxBackEnd::test_export2python_produces_correct_onnx_script_model_1257_test_triu_one_row

Stack Traces | 0.003s run time

onnxscript\backend\onnx_export_test.py:137: in extract_functions
    mod = importlib.import_module(import_name)
C:\hostedtoolcache\windows\Python\3.11.9\x64\Lib\importlib\__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
E   ModuleNotFoundError: No module named 'tests.onnx_backend_test_code.test_triu_one_row'

The above exception was the direct cause of the following exception:
.nox\test\Lib\site-packages\parameterized\parameterized.py:620: in standalone_func
    return func(*(a + p.args), **p.kwargs, **kw)
onnxscript\backend\onnx_export_test.py:271: in test_export2python_produces_correct_onnx_script_model
    functions = extract_functions(backend_test.name, code, self.test_folder)
onnxscript\backend\onnx_export_test.py:139: in extract_functions
    raise AssertionError(
E   AssertionError: Unable to import 'tests.onnx_backend_test_code.test_triu_one_row' (e=No module named 'tests.onnx_backend_test_code.test_triu_one_row') (file: 'D:\\a\\onnxscript\\onnxscript\\tests\\onnx_backend_test_code\\test_triu_one_row.py', absolute path: 'D:\\a\\onnxscript\\onnxscript\\tests\\onnx_backend_test_code\\test_triu_one_row.py', current folder: D:\a\onnxscript\onnxscript
E   ---- CONTENT --
E   import numpy
E   from onnx import TensorProto
E   from onnx.helper import make_tensor
E   from onnxscript import script, external_tensor
E   from onnxscript.values import Opset
E   from onnxscript.onnx_types import INT64
E   from onnxscript.onnx_opset import opset14
E   
E   @script()
E   def bck_test_triu_one_row(x: INT64[3,1,5], k: INT64) -> (INT64[3,1,5]):
E       y = opset14.Trilu(x, k)
E       return y

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