Support optional comma in closure use list

RFC: https://wiki.php.net/rfc/trailing_comma_in_closure_use_list
Discussion: https://externals.io/message/110715

The release manager h

Support optional comma in closure use list

RFC: https://wiki.php.net/rfc/trailing_comma_in_closure_use_list
Discussion: https://externals.io/message/110715

The release manager has agreed to allow merging of RFCs that have near-unanimous
votes. If an RFC ends up not achieving the required 2/3 majority at the time the
announced voting period closes, this implementation commit will be reverted
in time for the feature freeze.

Closes GH-5793

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