…thonLockfile` to `Lockfile`

These will be common types used across multiple languages like Python and Java.

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This also uses `WrappedLockfileRequest` so that we can make our tool lockfile code completely generic. We now have a way to dynamically compute which tools to generate lockfiles for, regardless of language.

The only thing not yet generic is user lockfiles.

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No changes made. Just moved around.

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This allows us to move that Python specific functionality out of the `generate-lockfiles` goal. We use a `@rule` so that the warning doesn't render more than one time.

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This is pretty involved. We need to first use a union to discover all "known" resolves per language. We then need another union to convert all _requested_ resolves for that language into concrete LockfileRequest subclasses

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…rs a `ToolLockfileSentinel`.

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