Introduce experimental APIs for conforming to "strict provenance".

This patch series examines the question: how bad would it be if we adopted
an extremely strict pointer provenance model that completely banished all
int<->ptr casts.

The key insight to making this approach even *vaguely* pallatable is the

ptr.with_addr(addr) -> ptr

function, which takes a pointer and an address and creates a new pointer
with that address and the provenance of the input pointer. In this way
the "chain of custody" is completely and dynamically restored, making the
model suitable even for dynamic checkers like CHERI and Miri.

This is not a formal model, but lots of the docs discussing the model
have been updated to try to the *concept* of this design in the hopes
that it can be iterated on.

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