[3.12] gh-104719: IDLE - test existence of all tokenize references. (GH-104767) (#104844)

gh-104719: IDLE - test existence of all tokenize references. (GH-104767)

Class editor.IndentSearcher contains all editor references to tokenize module.
Module io tokenize reference cover those other modules.

(cherry picked from commit e561c09975bf67ad8bb67c56a81e30a9165bcc84)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>