[3.12] [CVE-2023-27043] pythongh-102988: Reject malformed addresses i…

…n email.parseaddr() (pythonGH-111116)

Detect email address parsing errors and return empty tuple to
indicate the parsing error (old API). Add an optional 'strict'
parameter to getaddresses() and parseaddr() functions. Patch by
Thomas Dwyer.

(cherry picked from commit 4a153a1)

Co-authored-by: Victor Stinner <[email protected]>
Co-Authored-By: Thomas Dwyer <[email protected]>