[IMP] sms/mass_mailing: add emojis support to the base SmsWidget

This commit adds emojis to base SmsWidget in order to use a text field with
both sms and emoji widgets in "mass_mailing_sms" module for sms content.

The emoji feature is optional (depends on "enable_emojis" attribute). To add
the emoji support, the following changes have been made:

  * override the method "on_attach_callback" from emoji widget base code to
    hide emojis if not enabled;

We also adjust the css of emoji widget to make it suitable for a text field
with sms option.

Task ID-2224393
PR #49096

addons/mass_mailing/static/src/scss/mass_mailing.scss

@@ -14,7 +14,12 @@
         }
     }
 }
-
+.o_form_view {
+    // This will display the emoji widget in the right position after a text field with sms option.
+    .o_sms_container ~ .o_mail_add_emoji{
+        bottom: 55px;
+    }
+}
 .o_white_body {
     background-color: white;
 }