React Experimental Concurrent and Suspense Data Fetch

Implements all cases covered in the experimental page.

Branches

Data fetching strategies:

• fetch-on-render
• fetch-then-render
• render-as-you-fetch

Race Conditions:

• race-conditions-with-useEffect
• race-conditions-withComponentDidUpdate
• solving-race-conditions-with-suspense

Error Boundary:

• handling-errors