md-chip-set: emit input or change events

[bre97-web]

Description

change event

The change event should be emitted when a chip in the md-chip-set is selected.

<md-chip-set class="my-chip-set">
    <md-filter-chip label="Filter Label 1"></md-filter-chip>
    <md-filter-chip label="Filter Label 2"></md-filter-chip>
</md-chip-set>

<script>
const chipset = document.querySelector('.my-chip-set');
chipset.addEventListener('change', (e) => {
    // handle change
})
</script>