async _uibAttrScanAll(parentEl) {
    if (!Array.isArray(parentEl)) parentEl = [parentEl];
    parentEl.forEach(async (p) => {
      const uibChildren = p.querySelectorAll(__privateGet(this, _uibAttrSel));
      if (uibChildren.length > 0) {
        uibChildren.forEach((el) => {
          this._uibAttrScanOne(el);
        });
      }
    });
  }
Check all children of an array of or a single HTML element(s) for uib attributes and add auto-processors as needed.
Async so that calling function does not need to wait.
@param {Element|Element[]} parentEl HTML Element to check for uib-* or data-uib-* attributes
@private