.clang-format

rust: Move PyBytesWithData out of copy-tracing code

So we can use it in other places to.

Replace its `.data()` method with the `Deref<Target = [u8]>` trait,
allowing this type to be used in generic contexts.
Rename the type accordingly.

Differential Revision: https://phab.mercurial-scm.org/D11395

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