Expose 'parquet::record::make_row' function call to users

[jonded94]

Which issue does this PR close?

Closes #6761

Rationale for this change

parquet::record::make_row was not exposed to users, leaving them no option to create parquet::record::Row objects themselfes.

What changes are included in this PR?

parquet::record::make_row is exposed publicy.

[etseidl]

If we want to allow creating Rows outside the module, would it be better to add a public new() to the Row API? (And maybe get rid of make_row?)

cc @alamb @tustvold

[jonded94]

Implemented an alternative PR which does remove make_row entirely and creates a new method. #6763

Let me know whichever approach you prefer :) This unfortunately currently blocks a bit my work (I have some manual steps where I explicitly modify & create new Row instances and can't do that right now), so I'm happy to have quick progress here.