Features:

Features:
  * Implement lookbehind via tracker callbacks
  * Improve DSL
  * Rename maxLts to peek
  * Split lts visitors from visitors
  * Allow create table if not exists
  * Allow sampler to be triggered at every LTS
  * Allow local state validator to always run
  * Add Staged Runner
  * Add wait for token ranges
  * Make keyspace DDL configurable
  * Rename PartitionVisitor to Visitor

Bugfixes:
  * Fix for queue draining
  * Fix distribution of the single-op values
  * Fix bug in schema helper: static columns are listed as duplicates

Patch by Alex Petrov for CASSANDRA-16262

Co-authored-by: Caleb Rackliffe <calebrackliffe@gmail.com>