FFI for new rust functions

[bluegenes]

Recent functions added to rust core:

• signature::minhash
• signature::get_sketch
• sketch::minhash::sum_abunds
• sketch::minhash::n_unique_kmers,
• sketch::minhash::inflate
• sketch::minhash::inflated_abundances
• ani_utils::ani_from_containment
• ani_utils::ani_from_containment_ci
• ani_utils::prob_nothing_in_common