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

closes #6

Currently the API modules are hidden to the crate scope.

In order to avoid global permissive allows, they can initially be
exported, and tweaked to local scopes as they get implemented, finalized
and tested.

Related to #3