ENH: Give name to index column as argument when using df.reset_index

[gcaria]

Is your feature request related to a problem?

When resetting the index of a DataFrame, and when needing to rename the "index" column to something more useful, it would be nice to do it directly with the call toreset_index (and not afterwards with df.rename).

Describe the solution you'd like

DataFrame.reset_index should get a new parameter name that renames the "index" column after resetting.

API breaking implications

I don't see any obvious implications.

[jorisvandenbossche]

I think that would be a good idea, see #6878 (I think we can close this as a duplicate).

The main problem is that Series.reset_index already has a name keyword but that is used for the values column name, not index column name (so we will probably need another keyword name for this, unfortunately)

[gcaria]

Totally a duplicate, my bad for not checking properly! I'll have a look at #6878 and see if I can submit a PR.