Expand TPCH Documentation to include table names and schemas

[elharo]

e.g.
https://docs.snowflake.com/en/user-guide/sample-data-tpch

Also needed how do the names of schema relate to table sizes. E.g. is sf30000 30,000 rows per table or 30,000 bytes or what exactly?

This is in presto-docs/src/main/sphinx/connector/tpch.rst

[elharo]

This might be more important than I initially thought. See

#1771

Also, based on my initial tests it looks like it's still true that the standard column names aren't used, so I really need to know which column names are used.

[elharo]

also possibly related #19291 and tpch.column-naming