DataFrame addRow/addColumn doesnt work on empty frames

[AtharvaKhare]

Code:

x := DataFrame new.
x addRow: #(1 2 3)

Current workaround is:

x := DataFrame withColumnNames: #(1 2 3).
x addRow: #(1 2 3)

This is due to

DataFrame/src/DataFrame/DataFrameInternal.class.st

Lines 100 to 101 in c4a8684

	anArray size = rows
	ifFalse: [ SizeMismatch signal ].

[olekscode]

It seems like a bug that should be fixed.
Indeed, it would be nice to create an empty DataFrame and then fill it with values.
When adding a row, we could check if DataFrame is empty, and if yes, set the number of columns to the size of a new row.

But I have several doubts:

1. Do we want to make that check every time we add a row? Will it not slow down the operations that use add: (e.g., collect:, select:, ect.)?
2. Does it make sense to create a DataFrame with 0 columns and then resize it to fit the first inserted row? Would we do the same for Matrix?

Perhaps, we should check how this is done in pandas or R.