Add encoded property to the Toolbar items

[gdenchevprog]

Enhancement

Add 'encoded' property to the Toolbar items. Right now, the following snippet will produce an HTML encoded value:

    $("#toolbar").kendoToolBar({
        items: [
            { type: "button", text: "<span>Foo</span>" }
        ]
    });

Expected Result

The expected result of this enhancement is to enable the developers to turn on/off the HTML encoding.

[alestoya]

Reported in 1597774