This overload provides a middle ground between the very generic, but
hard-to-use "expert version" and to very restrictive and simplistic
"beginner version". It allows the user to declaratively describe the
to-be-generated population in terms of bunch
`std::uniform_int_distribution` objects (e.g. number of rows, size of
rows, etc.).
This allows for generating a random population in a controlled way, with
a minimum amount of boiler-plate code on the user side.
Allow the user to specify the population of the table in a generic and
flexible way. This patch essentially rewrites the `create_test_table()`
implementation from scratch, so that it populates the table using the
partition generator passed in by the user. Backward compatibility is
kept, by providing a `create_test_table()` overload that is identical to
the previous API. This overload is now implemented on top of the generic
overload.
In the next patches `create_test_cf()` will be made much more powerful
and as such generally useful. Move it into its own files so other tests
can start using it as well.
