add clip-convnext backbone (#21) #178

Job	Run time
build (ubuntu-latest, 3.7, 1.9.0+cpu, 0.10.0+cpu, https://download.pytorch.org/whl/torch_stable.h...	5m 11s
build (ubuntu-latest, 3.9, 1.13.1+cpu, 0.14.1+cpu, https://download.pytorch.org/whl/torch_stable....	15m 9s
build (ubuntu-latest, 3.10, 2.2.1+cpu, 0.17.1+cpu, https://download.pytorch.org/whl/torch_stable....	9m 53s
build (macos-latest, 3.7, 1.9.0, 0.10.0, https://download.pytorch.org/whl/torch_stable.html, true)	8m 33s
build (macos-latest, 3.9, 1.13.1, 0.14.1, https://download.pytorch.org/whl/torch_stable.html, tru...	11m 42s
build (macos-latest, 3.10, 2.2.1, 0.17.1, https://download.pytorch.org/whl/torch_stable.html, true)	13m 26s
build (windows-latest, 3.9, 1.13.1+cpu, 0.14.1+cpu, https://download.pytorch.org/whl/torch_stable...	8m 27s
	1h 12m 21s

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