code.replace() called as_interned_str().unwrap() on its string
arguments, which panics when the caller passes a string that has not
been interned. modulefinder's replace_paths_in_code() builds a fresh
co_filename, so any use of ModuleFinder(replace_paths=...) aborted the
interpreter.
Intern the incoming strings instead, and raise TypeError rather than
panicking when a non-string appears in co_names/co_varnames/
co_cellvars/co_freevars.
Unskips test_modulefinder.test_replace_paths.
Co-authored-by: Pablo Garcia <pablito@MacBook-Neo-de-Pablo.local>
