Add Support for Child Tasks for Better Task Organization

[HenriqueOliveira18]

It would be incredibly helpful to have support for child tasks (subtasks) in Solidtime to improve task management and organization. This feature would allow users to break down larger tasks into smaller, more manageable steps, providing better visibility into progress and priorities.

Proposed Features:

Task Hierarchy

• Allow users to create a parent task and associate child tasks with it.
• Display the hierarchy clearly in the task list or project view.

Progress Tracking:

• The parent task’s completion status could be linked to its child tasks (e.g., showing a percentage based on completed subtasks).

UI/UX:

• Visual indicators to differentiate parent tasks from child tasks (e.g., icons or indentation).