Tracking: import test cases from other DBs

[lmatz]

• Postgres Tracking: enable PostgreSQL regress tests #4089
• DuckDB Tracking: enable DuckDB tests #5970
• CRDB Tracking: enable CockroachDB logictests #6003
• SQLite Tracking: enable Sqllogictest tests in Sqlite #5997

PG: We want to be reasonably compatible with PG.
DuckDB: It is pretty popular and gaining more momentum nowadays and the test cases are pretty well categorized.
CRDB: It is also used by many other (streaming) DBs.
SQLite: It is a very rich source of test cases. Lots of other DBs use it. Long track record.

[lmatz]

I agree that postgres contains too many features that we will never need

but the test cases from duckdb and sqllogictest seem relatively clean, i.e. a limited set of feature but test many combinations of them.

I suggest after reviewing duckdb, we proceed to sqllogictest next.

[xiangjinwu]

Also note that duckdb and sqlite is not PostgreSQL-compatible (e.g. #8830 (comment)), and may contain features not supported by PostgreSQL. It is not a goal to be able to pass their tests unmodified.