* backport new column families from master to 1.6 (#18743) * backporting bank_hash and program_costs column families from master to 1.6 for rocksdb backward compatibility * missed a line to allow dead code * include code for purge * Exclude stubbed ProgramCosts column from compaction (#18840) Co-authored-by: Tao Zhu <82401714+taozhu-chicago@users.noreply.github.com>