Benchmark and end2end tests for walker.
Benchmark and end2end tests for walker.

Comparing BloomNode trie to re:
trie 27.41x faster for ['.e.k.n.']
trie 90.43x faster for ['s.e.i.g']
trie 310.86x faster for ['s.e.i.g', '.e.k.n.']

PhilHarnish/forge,PhilHarnish/forge,PhilHarnish/forge,PhilHarnish/forge,PhilHarnish/forge,PhilHarnish/forge