bloomfilter-rb pure ruby example: stop using `Digest::MD5` and friends; stop using bitset gem; add pure Ruby BitSet class

just use CRC32
it's fast and works very well for purpose

This PR reduces dependencies and complexity while improving performance and silencing some warnings. It also renames "hashes" to "aspects". Consider that a CRC is not a hash. Anyway, if this part is controversial, I can revert / rename.

Mar 11 '24 22:03 rickhull

Also: I now have a pure Ruby BitSet impl: https://github.com/rickhull/compsci/blob/master/lib/compsci/bitset.rb

We can easily adapt it here and remove the bitset gem dependency, which is a C extension, rather unmaintained. It fails to build on ARM right now.

The pure ruby BitSet is half the performance of the C extension, but that's a win in my book.

Mar 20 '24 01:03 rickhull

I updated the PR to include the pure ruby BitSet impl and remove the bitset gem

Mar 22 '24 15:03 rickhull

also, stop using the old set/set?(plural) interface, and start using #add(singular) and #include?(singular)

Mar 26 '24 22:03 rickhull