SOC-3787 | [Social Notification] Save button is not disable when nothing is changed
SOC-3702 - 3718 | Refactor Untils on social notification plugin and logic process case number users/spaces on digest.

Conflicts:

	component/notification/src/main/java/org/exoplatform/social/notification/Utils.java
	component/notification/src/main/java/org/exoplatform/social/notification/plugin/NewUserPlugin.java
	component/notification/src/main/java/org/exoplatform/social/notification/plugin/SpaceInvitationPlugin.java

Conflicts:

	component/notification/src/main/java/org/exoplatform/social/notification/plugin/NewUserPlugin.java