feat: tablerowloop object

See: https://www.rubydoc.info/gems/liquid/Liquid/TablerowloopDrop

src/util/promise.ts

@@ -1,19 +0,0 @@
-/*
- * Call functions in serial until someone rejected.
- * @param {Array} iterable the array to iterate with.
- * @param {Array} iteratee returns a new promise.
- * The iteratee is invoked with three arguments: (value, index, iterable).
- */
-export function mapSeries<T1, T2> (
-  iterable: T1[],
-  iteratee: (item: T1, idx: number, iterable: T1[]) => Promise<T2> | T2
-): Promise<T2[]> {
-  let ret = Promise.resolve(0)
-  const result: T2[] = []
-  iterable.forEach(function (item, idx) {
-    ret = ret
-      .then(() => iteratee(item, idx, iterable))
-      .then(x => result.push(x))
-  })
-  return ret.then(() => result)
-}