perf(ngOptions): use documentFragment to populate select

This changes the way option elements are generated when the ngOption collection changes.
Previously, we would re-use option elements when possible (updating their text and
label). Now, we first remove all currently displayed options and the create new options for the
collection. The new options are first appended to a documentFragment, which is in the end appended
to the selectElement.

Using documentFragment improves render performance in IE with large option collections
(> 100 elements) considerably.

Creating new options from scratch fixes issues in IE where the select would become unresponsive
to user input.

Fixes #13607
Fixes #13239
Fixes #12076