Allow optional ellipsoid definition to be passed to distance allowing for calculation types other than great circle #2476

…d if they do perform an ellipsoidal distance calculation rather than the default great circle.

…al packages/turf/ conversion from mjs to rolled up js. "In strict mode code, functions can only be declared at top level or inside a block."

…meaning we can use import rather than require. Tightened up distance module function names and their optional parameters as well.