gh-153502: Add uid parameter to imaplib command methods (GH-153508)

gh-153502: Add uid parameter to imaplib command methods (GH-153508)

Add a keyword-only uid=False argument to IMAP4.copy(), move(), fetch(),
store(), search(), sort(), thread() and expunge(), selecting the UID
variant of the command as a shorthand for uid().  expunge() also gains
an optional message_set argument, required for UID EXPUNGE.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>