Renamed wb.experts.EntityIdInput to wb.experts.Entity

Change-Id: I0691153b60531125c360f8da3b952a17dd3e6e5f
Spin off wb.experts.Item from wb.experts.Entity

Change-Id: I300a3abf0f10f0b3cf8048215ccd015e6e369fee
Implemented wb.experts.Property

for referencing Wikibase Properties

Bug: T76704
Change-Id: I002bd7f50fc951838a97f473ac9e1207023e2064
Merge "Renamed wb.experts.EntityIdInput to wb.experts.Entity" into wmf/1.25wmf12c
Merge "Spin off wb.experts.Item from wb.experts.Entity" into wmf/1.25wmf12c
Merge "Implemented wb.experts.Property" into wmf/1.25wmf12c