Extend API to query for Tasks updated after a specified date

User Story (Required on creation):
As a software developer I want to be able to query for user tasks that were updated after a specific date. This allows me to update my proprietary task list on changes of the task status.

Functional Requirements (Required before implementation):

• Extend REST interface by" "updatedAfter" filter
• Extend Java API (TaskQuery) by "updatedAfter" filter
• All API can sort results by the update timestamp
• The task entity will store a lastUpdate timestamp that updates on every update of the entity
• The following events from the Task Event Lifecycle count as updating the task entity:
  • create: If no lastUpdate timestamp is set the creation date of the task is the last update
  • update: updating any property on the task entity (including assignee and dependent entities like local task variables) will set the lastUpdate

Limitations of Scope (Optional):

• Historic task entities are out of scope. The APIs will only return runtime tasks and no lastUpdate timestamp is stored on historic task entities.
• The following events from the Task Event Lifecycle do not count as updating the task entity:
  • assignment: Changes to the assignee property of the task entity will trigger the update event. This means we can safely ignore the assignment event for this use-case.
  • timeout: A timeout is triggered by flow logic and does is not considered an update to the task entity.
  • delete: Deleting the task will cause the engine to remove the runtime data. After this event the task query APIs will not return a result for this entity anymore. This means we don't need to considder it an update for this use-case.
  • complete: Completing a task will cause it to be deleted and become historic data. This means we don't need to consider it an update for this use-case.

Hints (Optional):

• AP_TManagement/21-12-16 TSysDE - SUPPORT-12270.md at main · camunda/AP_TManagement (github.com)