[Platform] [User Notifications][TUS] Events are created when Idea is created or updated

[becevka]

Summary
In order to support User Notifications, we need to create events upon Idea creation or updates.

Describe the solution you'd like
Event Collection should consist of the following fields:

• entityId, numeric id of the business-level entity (IdeaCard)
• entityType, enum value of business-level entity type (IdeaCard only for now)
• title, top-level description of event
• content, details of the event
• createdDateTime, date when event was created

When user creates Idea, event is generated with the Title "Idea Submitted Successfully" and content '{userName} added new idea, {ideaName} - {tagline} '.

When idea is updated and status was changed, event is generated with the Title "Idea {ideaName} is {status}" and content '{userName} has updated idea {ideaName} - {status}'

When idea is updated but no status changed, event is generated with the Title "Idea {ideaName} was updated" and content '{userName} has updated idea {ideaName}'

Events endpoints should not be available through API.

Acceptance Criteria

Generated by Zenhub AI

• Scenario: Event creation upon Idea creation
  • Given a new Idea is created
  • When the Idea is successfully created
  • Then an event with title "Idea Submitted Successfully" and content "{userName} added new idea, {ideaName} - {tagline} " is created
• Scenario: Event creation upon Idea status change
  • Given an Idea has its status changed
  • When the Idea status is successfully changed
  • Then an event with title "Idea {ideaName} is {status}" and content "{userName} has updated idea {ideaName} - {status}" is created
• Scenario: Event creation upon Idea update without status change
  • Given an Idea has its content updated without changing the status
  • When the Idea update is successfully made
  • Then an event with title "Idea {ideaName} was updated" and content "{userName} has updated idea {ideaName}" is created