Add ONNX export support for TextNet #43

Job	Run time
build (3.10, macos-15, test_modeling_gemma2.py)	1h 1m 52s
build (3.10, macos-15, test_modeling_gemma.py)	52m 2s
build (3.10, macos-15, test_modeling_llama.py)	12m 41s
build (3.10, macos-15, test_modeling_olmo.py)	14m 23s
build (3.10, macos-15, test_modeling.py)	12m 29s
build (3.10, macos-15, test_modeling_qwen2.py)	5m 35s
build (3.11, macos-15, test_modeling_gemma2.py)	1h 4m 8s
build (3.11, macos-15, test_modeling_gemma.py)	54m 8s
build (3.11, macos-15, test_modeling_llama.py)	12m 38s
build (3.11, macos-15, test_modeling_olmo.py)	13m 51s
build (3.11, macos-15, test_modeling.py)	11m 55s
build (3.11, macos-15, test_modeling_qwen2.py)	6m 21s
build (3.12, macos-15, test_modeling_gemma2.py)	1h 2m 6s
build (3.12, macos-15, test_modeling_gemma.py)	55m 27s
build (3.12, macos-15, test_modeling_llama.py)	12m 44s
build (3.12, macos-15, test_modeling_olmo.py)	13m 25s
build (3.12, macos-15, test_modeling.py)	12m 6s
build (3.12, macos-15, test_modeling_qwen2.py)	5m 33s
	8h 3m 24s

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