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A pants_lock binary. (Cherry-pick of #23530) (#23560)

This is a vastly simplified version of the flock(1) Linux binary 
(which alas is not available on macOS, or we would simply use it).

It takes a file descriptor inherited from its parent process and blocks
until it can acquire a fcntl lock.

This PR consists of:

1. The plumbing for building the binary, embedding it in the pants
    dist and extracting it for execution.
2. The pants_lock functionality.
3. Tests for the above.

A follow up change will use this binary in the uv integration.

Co-authored-by: Benjy Weinberger <benjyw@gmail.com>

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