Implement a dbgen compatible command line API

[alamb]

The tpch data generator also includes a command line utility:

For example, to make scale factor 0.1 (100M):

 ./dbgen -f -s 0.1

The code and flag meaning is on https://github.com/databricks/tpch-dbgen

Here are some examples if its use from the datafusion repo:

          mkdir -p datafusion/sqllogictest/test_files/tpch/data
          git clone https://github.com/databricks/tpch-dbgen.git
          cd tpch-dbgen
          make
          ./dbgen -f -s 0.1
          mv *.tbl ../datafusion/sqllogictest/test_files/tpch/data

https://github.com/apache/datafusion/blob/9382add72b929c553ca4976d1423d8ebbc80889d/benchmarks/bench.sh#L358-L357

[clflushopt]

That's next after I add a test suite thanks for opening the issue I forgot to add it for tracking !

[alamb]

I would love to help with this -- and I will with wahtever is needed once I have made a bit more progress on

• [EPIC] Complete SQL EXPLAIN Tree Rendering apache/datafusion#14914

my current obsession:

• Support different EXPLAIN formats via SQL apache/datafusion#15021

[clflushopt]

Closed in #12 any further work to improve the UX will be via a separate issue.