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Rename `extension` crate to `extension_host` (#20081)

This PR renames the `extension` crate to `extension_host`.

This is to free up the name so that we can create a smaller-scoped
`extension` crate.

Release Notes:

- N/A
M
Marshall Bowers committed
ea44c510a3d696aaba0189b55efde81514b02ed9
Parent: c8f1969
Committed by GitHub <noreply@github.com> on 11/1/2024, 4:53:02 PM