Issue 45810: Prohibit invisible control characters in string literals and comments

Currently invisible control characters aside from whitespace (tabs, newlines, formfeeds, carriage returns) are prohibited outside of comments and string literals. As discussed in this thread:

https://mail.python.org/archives/list/python-dev@python.org/message/DN24FK3A2DSO4HBGEDGJXERSAUYK6VK6/

we should ban C0 and C1 control characters (aside from \t\n\f\r) in string literals and comments too.

To be clear, the ban is on actual invisible control characters, not escape sequences.