Add filter feature to PickList

[mertsincan]

Name	Type	Default	Description
filterBy	string	null	When specified displays an input field to filter the items on keyup and decides which field to search (Accepts multiple fields with a comma).
filterMatchMode	string	contains	Defines how the items are filtered, valid values are "contains" (default) "startsWith", "endsWith", "equals", "notEquals", "in", "lt", "lte", "gt" and "gte".
filterLocale	string	undefined	Locale to use in filtering. The default locale is the host environment's current locale.
sourceFilterValue	string	null	Filter value in the target list.
targetFilterValue	string	null	Filter value in the source list.
showSourceFilter	boolean	true	Whether to show filter input for source list when filterBy is enabled.
showTargetFilter	boolean	true	Whether to show filter input for target list when filterBy is enabled.
sourceFilterPlaceholder	string	null	Placeholder text on source filter input.
targetFilterPlaceholder	string	null	Placeholder text on target filter input.
sourceFilterTemplate	any	null	Template for the source filter content.
targetFilterTemplate	any	null	Template for the target filter content.

Name	Parameters	Description
onSourceFilterChange	event.originalEvent: Browser eventevent.value: Filtered value	Callback to invoke when items are filtered within source list.
onTargetFilterChange	event.originalEvent: Browser eventevent.value: Filtered value	Callback to invoke when items are filtered within target list.