Adds SelectModeCell for CircleListView

[rookiejava]

Description of Change

This PR adds the following two features.

1. Adds ItemLongPressed event to CircleListView
2. Adds cells that supports a selection mode to select each item in the ListView
   • It can be used with the ItemLongPressed event added above. For detailed usage, please refer to the example code in this PR.

• partially fixes CircularListView ContextAction or Long Holding action #326

ℹ️ Remark
The cells that support selection mode are the following three cells, and can be used only when used with the CircleListView.

• SelectModeTextCell
• SelectModeImageCell
• SingleTextCell

Bugs Fixed

None

API Changes

Added:

• public event CircleListView.ItemLongPressed
• interface ISelectModeCell
• public class SelectModeTextCell
• public class SelectModeImageCell
• public class ItemLongPressedEventArgs

Behavioral Changes

None

[EmilAlipiev]

ItemLongPressed working great. thank you :)