Split clickbench query set into one file per query

[pepijnve]

Which issue does this PR close?

None

Rationale for this change

Clickbench query IDs are zero-based while most editors are one-based wrt line numbers. This causes a little bit of friction every time you want to check the query for a particular clickbench run.

There's precedent in the benchmark suite already for having one file per query rather than one file with a query per line. By having distinct files, the query id can be reflected in the filename making lookup trivial.

What changes are included in this PR?

• Add a script to download the upstream queries.sql file from the clickbench repo and split it into one file per query
• Adapt the clickbench benchmark code to read queries from individual files
• Adjust parameters in bench.sh
• Adapt the sql_planner benchmark code to read queries from individual files

Are these changes tested?

Manually tested

Are there any user-facing changes?

No