feat(toast): Improve notifications onto the hole website after user action

[JNSPK]

Several improvements to do :

• Should notify errors when fetching ressource is failing
• Should notify when an opportunity is bookmarked or removed from bookmarks
• Should notify when a content is reported

[douglasduteil]

Should notify for all existing notification types too

• when a message is revived
• when a proposal is made
• etc...

[douglasduteil]

\linked to NotificationType

enum NotificationType {
  EXCHANGE_COMPLETED
  EXCHANGE_NEW_MESSAGE
  EXCHANGE_NEW_PARTICIPANT
  FORUM_NEW_AWNSER
  INBOX_NEW_MESSAGE
  PROFILE_ADDED
}