feat: execute promise immediately **BREAKING CHANGE**

[pikax]

Changes the behaviour of usePromise, before usePromise was lazy, it would be only executed once exec is called, now it will be executed straight away.

second argument of usePromise also changes from throwException to lazy

New composable added usePromiseLazy, just a sugar for usePromise with lazy: true

//implementation of usePromiseLazy

function usePromiseLazy(fn, throwException) {
  return usePromise(fn, {
    lazy: true,
    throwException
  });
}