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revlog: using two new functions in C capsule from Rust code

Authored by gracinet.

Description

revlog: using two new functions in C capsule from Rust code

We expose index_length and index_node in the C capsule, so that
the Rust representation of the C index can implement the RevlogIndex
trait.

Because our Node is actually a one-field struct, we have
to decorate it for direct FFI exchange with the C char*

It would be a good thing to get a length from the C layer, but doing
so right now would probably interfere with the upcoming changes that
will happen there for the hash length.

Differential Revision: https://phab.mercurial-scm.org/D8152

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