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rust: Make NodePrefix allocation-free and Copy, remove NodePrefixRef

The `*Ref` struct only existed to avoid allocating `Vec`s
when cloning `NodePrefix`, but we can avoid having `Vec`
in the first place by using an inline array instead.

This makes `NodePrefix` 21 bytes (with 1 for the length)
which is smaller than before as `Vec` alone is 24 bytes.

Differential Revision: https://phab.mercurial-scm.org/D9863

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