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Write Python lockfile metadata to separate files (#22713)

Currently we tack it on as a header to the lockfile, which
makes the lockfile unusable when working directly with Pex
without first manually editing it to remove the header.

Instead, we now (optionally) write to a separate metadata
sibling file. 

We always unconditionally try and read the metadata file,
falling back to the header if it doesn't exist. This will
allow us to regenerate the embedded lockfiles without
worrying about whether the user has the new metadata
files enabled.

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