✨ Put a bloomfilter into the Parquet metadata and use for filtering

[joocer]

https://github.com/inveniosoftware-contrib/intbitset > replace bitarray with something integrated

[joocer]

5 hashes and a 2Kbyte slot table will give about 9.8% FP rate on 10,000 items

5 hashes can't quite be made from a single 64bit hash (need 65bits [5*13bits]) - but this is worth testing to see if XORs etc creating the 5th hash still gets the same FP rate.