Handle setting and updating an overarching goal

[jhodapp]

Description

This PR sets and updates an overarching goal for this coaching session.

Note: pairs with this backend PR

GitHub Issue: None

Changes

• Adds a new OverarchingGoalContainer component that contains the OverarchingGoal, the AgreementList and the ActionList components
• Adds a new OverarchingGoal component that handles setting/updating an overarching goal

Screenshots / Videos Showing UI Changes (if applicable)

Drawer closed:

Drawer opened:

Testing Strategy

1. Navigate to a coaching session page
2. Click the down chevron button to expand the drawer
3. You should be able to click in the overarching goal line into a textbox and type a new goal
4. Either click "Set" or press with the focus in the textbox
5. Notice that the drawer closes and the overarching goal label should be updated with whatever you entered.

Concerns

None