Provide a way to easily clear the selected values from a multiselect. Similar functionality can be achieved by achieved by setting the value of the multiselect to an empty array, however this does not deselect the items in the dropdown portion of the multiselect, and the items must be clicked twice to reselect them. The clear should function the exact same as the built in clear button. 

https://5ec2yi.run.stackblitz.io/