* More use of `anyhow`.
* Change `make_accessible` into `protect_linear_memory` to better demonstrate
what it is used for; this will make the uffd implementation make a little
more sense.
* Remove `create_memory_map` in favor of just creating the `Mmap` instances in
the pooling allocator. This also removes the need for `MAP_NORESERVE` in the
uffd implementation.
* Moar comments.
* Remove `BasePointerIterator` in favor of `impl Iterator`.
* The uffd implementation now only monitors linear memory pages and will only
receive faults on pages that could potentially be accessible and never on a
statically known guard page.
* Stop allocating memory or table pools if the maximum limit of the memory or
table is 0.
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