Added Input data containers branch

[pep8speaks]

Hello @Prajwal-Prathiksh! Thanks for opening this PR.

• In the file code/data_containers/TSPLIB_data_container.py:

Line 58:53: E226 missing whitespace around arithmetic operator Line 58:81: E501 line too long (88 > 80 characters) Line 59:81: E501 line too long (86 > 80 characters)

• In the file code/data_input/base_input.py:

Line 73:50: E502 the backslash is redundant between brackets Line 74:17: E128 continuation line under-indented for visual indent

Do see the Hitchhiker's guide to code style