Parsl distribution for minhash

[KPHippe]

Minimal implementation of parsl distribution for computing minhashes.

A couple of sticky points:

• did not use MinHasher as intended, kind of hacked around it so the core is the same
• using all available workers to compute minhash, then keeping the job alive and using a single worker for minhash so it doesn't get computed on the pilot (deduplication/workflows:196)
• Made a wrapper for the LSHBloom (deduplication/lshbloom) so that it could run via parsl