Add examples to the docs of running the various TPC-H queries

[thisisnic]

Now that we've implemented the functionality required to run the TPC-H queries, we could add examples of these to the docs. First, we should resolve the minor issues which appeared when comparing the results to those generated from running the queries directly on DuckDB:

• [x] 1 - matches
• [ ] 2 - blocked by issues with grepl
• [x] 3 - matches
• [x] 4 - matches
• [ ] 5 - error
• [x] 6 - matches
• [ ] 7 - error - no function "year"
• [ ] 8 - error in converting i64
• [ ] 9 - error in converting i64
• [x] 10 - matches
• [ ] 11 - matches but as_quosure warning
• [x] 12 - matches
• [ ] 13 - duckdb sum boolean error
• [ ] 14 - value mismatch
• [x] 15 - matches
• [ ] 16 - error in converting i64
• [x] 17 - matches
• [ ] 18 - missing column
• [x] 19 - matches
• [ ] 20 - error reading in input file
• [ ] 21 - differences in values
• [ ] 22 - duckdb unsupported join type