[do not merge] Add mcp-codemod, an automated v1 to v2 migration tool #3150

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	49s
checks / docs	41s
checks / test (3.10, locked, ubuntu-latest)	1m 18s
checks / test (3.10, locked, windows-latest)	1m 40s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.11, locked, windows-latest)	1m 37s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.10, lowest-direct, windows-latest)	1m 30s
checks / test (3.11, lowest-direct, windows-latest)	1m 38s
checks / test (3.11, locked, ubuntu-latest)	1m 8s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.12, lowest-direct, windows-latest)	1m 45s
checks / test (3.12, locked, windows-latest)	1m 39s
checks / test (3.12, locked, ubuntu-latest)	1m 32s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.13, lowest-direct, windows-latest)	1m 42s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.13, locked, ubuntu-latest)	1m 5s
checks / test (3.13, locked, windows-latest)	1m 23s
checks / test (3.14, lowest-direct, windows-latest)	1m 23s
checks / test (3.14, locked, ubuntu-latest)	2m 13s
checks / test (3.14, locked, windows-latest)	2m 23s
all-green	3s
	31m 58s

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