This commit introduces the re-export of the listed primitives.

They will be used inside Miden to report the security level of the
picked primitive, as well as other functionality.

closes #72

This commit moves the previous implementation of `SparseMerkleTree` from
miden-core to this crate.

It also include a couple of new tests, a bench suite, and a couple of
minor fixes. The original API was preserved to maintain compatibility
with `AdviceTape`.

closes #21

closes #6

closes #5

This commit introduces a workspace structure with a `Cargo.toml`.
Currently we have a single member `crypto`, but these can be added
incrementally in the future.