Add mailmap for commits made by xes@meta.com

.mailmap

@@ -166,6 +166,7 @@ Eduard-Mihai Burtescu <edy.burt@gmail.com>
 Eduardo Bautista <me@eduardobautista.com> <=>
 Eduardo Bautista <me@eduardobautista.com> <mail@eduardobautista.com>
 Eduardo Broto <ebroto@tutanota.com>
+Edward Shen <code@eddie.sh> <xes@meta.com>
 Elliott Slaughter <elliottslaughter@gmail.com> <eslaughter@mozilla.com>
 Elly Fong-Jones <elly@leptoquark.net>
 Eric Holk <eric.holk@gmail.com> <eholk@cs.indiana.edu>