Optimize miner for parallelize plot proof read/search

[reb0rn21]

Chia 1.17+ will have parallel proof read from plots here is the code: https://github.com/Chia-Network/chiapos/commit/3feab20dca377ee0c3723419a02cf6901709a309

this gona speed miner proof search by 2-5x!

pls optimize your own, as we see many ppl have slow plots!

[terabyte84]

An optimization on scan time is really needed. Many people are trying to work with s3 buckets and have scan time errors with hpool while the solo pool works perfectly fine.