Check get_encoding to accept only bytes

[paul-tharun]

The get_encoding function accepts both bytes and str( http url) this results in two http calls when the input is a http url.(One in get_encoding , other in read_csv)

TODO:
Check this so the content is fetched before and only bytes are passed to both the get_encoding and read_csv functions.

REF:

hunting/app/utils/dataframes.py

Line 29 in 13cb426

if not is_object: