[Enhancement] Diamond prescreen before exonerate

[fbemm]

This is just to drop the idea. Tools like maker or funannotate pre-screen protein databases against the genome with diamond before starting to generate exonerate alignments only for significant pairings. Especially useful with larger protein files (e.g., SwissProt). Would be a nice thing to have. I can work on a PR, but this will take a while.

[ifiddes]

I can try to find time to do this; the protein component of this pipeline were definitely an afterthought and need to be more thoroughly vetted.