feat(v3): add v3 migration codemod (#334) #1231

Job	Run time
Build docs	27s
Lint and type checks	42s
Build package	22s
Test Python 3.14 on macos-latest	1m 3s
Test Python 3.10 on ubuntu-latest	51s
Test Python 3.8 on ubuntu-latest	39s
Test Python 3.13 on ubuntu-latest	58s
Test Python 3.11 on ubuntu-latest	49s
Test Python 3.14 on windows-latest	1m 34s
Test Python 3.7 on ubuntu-22.04	43s
Test Python 3.9 on ubuntu-latest	42s
Test Python 3.14 on ubuntu-latest	1m 3s
Test Python 3.12 on ubuntu-latest	58s
Deploy docs to GitHub Pages	0s
Deploy package to PyPI	-1s
	10m 50s

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