Add a TUI to the addon

[matejak]

The TUI interface is one of the two interactive interfaces an Anaconda addon may implement.

[pep8speaks]

Hello @matejak! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file org_fedora_oscap/tui/spokes/oscap.py:

Line 54:1: E731 do not assign a lambda expression, use a def
Line 55:1: E731 do not assign a lambda expression, use a def
Line 71:5: E266 too many leading '#' for block comment

[scrutinizer-notifier]

The inspection completed: 12 updated code elements

[poncovka]

Are you sure you want to run this spoke in the initial setup on first boot?