opt: add optimizer tests for clickbench

This commit adds a set of optimizer tests for clickbench with and
without indexes, pulled from [1] and [2]. This may help to show
opportunities for improvements on clickbench-like workloads and
avoid future regressions.

1. https://github.com/ClickHouse/ClickBench/tree/main/cockroachdb
2. https://github.com/ClickHouse/ClickBench/tree/main/postgresql-indexed

Epic: None

Release note: None

Author: DrewKimball