[Feature] Knowing when I completed a subtask, add the completion time to the API.

[Ldr0Luis0dorato]

Basically, add the time to the \history and \task endpoints of the subtasks that have been completed.
I want to better manage my day, and knowing the team that completed these subtasks is quite important.
In my gamification, I use subtasks a lot because they can synthesize many things in a small space, which greatly reduces the friction to complete them. However, I miss this functionality.

[Ayagikei]

Thank you for your suggestion! We will evaluate it at a later stage.