Finish BINNTS

[cliffckerr]

• 0:10 Finish conceptual design
• 1:00 Implement in parestlib
• 0:30 Implement tests and check performance
• 0:30 Implement for Covasim

[cliffckerr]

Look into https://pubmed.ncbi.nlm.nih.gov/29518570/ (thanks @RomeshA !)

Code: https://github.com/jajcayn/pygpso