refetch function in MantleProvider should be memoized

[Jimin-Genie]

Problem

• We wanted to refetch some data inside useEffect
• Linting rule dictates that if we use refetch inside of useEffect it has to be included in the dependency array.
• In each UI component re-render, we noticed that the refetch function is redefined and retriggering the use-effect every time.

refetch function defined here, should be memoized.