✨(dimail) add reset password method

allow domain owner and admins to reset password for a mailbox
they manage. The request is sent to dimail, which responds with
a new randomly generated password. This new password is sent to
secondary email.

src/backend/mailbox_manager/api/client/viewsets.py

@@ -293,6 +293,15 @@ class MailBoxViewSet(
         mailbox.save()
         return Response(serializers.MailboxSerializer(mailbox).data)
 
+    @action(detail=True, methods=["post"])
+    def reset_password(self, request, domain_slug, pk=None):  # pylint: disable=unused-argument
+        """Send a request to dimail to change password
+        and email new password to mailbox's secondary email."""
+        mailbox = self.get_object()
+        dimail = DimailAPIClient()
+        dimail.reset_password(mailbox)
+        return Response(serializers.MailboxSerializer(mailbox).data)
+
 
 class MailDomainInvitationViewset(
     mixins.CreateModelMixin,