[INTERNAL] sap.ui.model.ListBinding: Define abstract method #getAllCurrentContexts
[INTERNAL] sap.ui.model.ListBinding: Define abstract method #getAllCurrentContexts

PS1: Do it
PS2: Review comments
PS3: Review comments
PS4: Improve JSDoc
PS5: Review comments

Change-Id: Iafe1c4b194bb623868208b468eaca13336e90f48
JIRA: CPOUI5MODELS-741

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5