Remove the index 0 from `--out` files

[Ian-Fogelman]

Currently any file output with --out will have the 0 based index from a dataframe in the output file.

It would be better if this was not the default and instead only rows were returned.

Current behavior:

s3sql query ... --out "output.csv"

	Data
0	A
1	B
2	C

New behavior:

s3sql query ... --out "output.csv"

Data
A
B
C

It would also be nice to automatically assign an ID column if the -- id flag was passed

s3sql query ... --out "output.csv" --id 

Id	Data
1	A
2	B
3	C