Add enter key input event listener to the Datepicker module

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.0.x, master
• Fix Version/s: 2.0.x, master, master-deprecated, 3.0.x, 2.0.0.78-deprecated, 3.1.x
• Component/s: DatePicker
• Labels: None
• Git Pull Request: https://github.com/mairatma/alloy-ui/pull/128

The datepicker needs to have the option to listen for the enter key event when the trigger is a text input. Necessary for LPS-50202.