mailmap: add name/email aliases for yuangongji (name and email)

Before:
  $ git log --format='%aE %aN' --author=yuangongji | sort | uniq -c
       30 [email protected] yuangongji
        1 [email protected] yuangongji (A)

After:
  $ git log --format='%aE %aN' --author=yuangongji | sort | uniq -c
       34 [email protected] yuangongji
(cherry picked from commit 026590f)

Author: azat

Diff for: .mailmap

@@ -1,5 +1,7 @@
 # name -> email
 Azat Khuzhin           <[email protected]>
+yuangongji             <[email protected]>
 
-# email -> email
-<[email protected]>    <[email protected]>
+# primary email -> alias
+<[email protected]>                   <[email protected]>
+yuangongji <[email protected]>   <[email protected]>