(fix): resolve AsyncLocalStorage Illegal Invocation errors

[agilgur5]

• I (and apparently most mst-persist users) don't use localStorage, so
  this went undetected for a while until someone reported a bug

  • and I finally hit upon it myself when adding tests shortly after,
    which added a solid reproduction as well as a blocker on it

• it made localStorage unusable as all of AsyncLocalStorage's calls
  would give Illegal Invocation errors

  • see https://stackoverflow.com/q/41126149/3431180 for more details
    on this error
    • using .call did not work, not on
      callWithPromise.call(window, ...) nor func.call(window, ...args)
    • similarly window.localStorage.func.bind(window) did not work
    • so instead used wrapper functions as an alternative that didn't
      feel too convoluted
      • using window.localStorage[funcKey] in callWithPromise did not
        quite feel right, wrapper functions felt better

Fixes #18 . Split out of #21 -- was reproduced while creating tests and is needed for tests to pass as well. The fix for this was tested locally against #21, so can be confident it works.

[agilgur5]

Looks good now! (The addition of the comment with a link to the issue was the last thing I amended).

Think the commit message should be edited to say "until someone filed an issue for it". Also there's a typo, should be "hit upon it"