feat(mail): allow setting of mailer identifying name (#5363)

client/graph/admin/mail/mail-mutation-save-config.gql

@@ -18,6 +18,7 @@ mutation (
       senderEmail: $senderEmail,
       host: $host,
       port: $port,
+      name: $name,
       secure: $secure,
       verifySSL: $verifySSL,
       user: $user,

client/graph/admin/mail/mail-query-config.gql

@@ -5,6 +5,7 @@
       senderEmail
       host
       port
+      name
       secure
       verifySSL
       user