Templated benchmarks improvements

[bpkroth]

• enable testing locally via docker build-run script
• enable random seed from config
• enable sqlite support
• use sqlite support to implement unit tests
• use unit tests to walk through debugger to find error (csv parsing)
• left some TODO comments about adding support for NULL processing
  • I handled one of these, but there's some lingering work that should probably be taken up separately for improving this to be able to pass NULLable values as a parameter.
    For instance, c VARCHAR(255) NULL type columns can't receive a NULL value atm via something like <value /> since the values are passed to the constructors as a comma separated string list, which gets parsed back out as an empty string.