[INTERNAL] sap.ui.model.ListBinding: define requestFilterForMessages
[INTERNAL] sap.ui.model.ListBinding: define requestFilterForMessages

PS1: TDD SBE / SSC: defined the function; implementation for OData V2
     will follow in another change
PS2: TDD SBE / SSC: Review comments
PS3: Using @example for the sample code
PS4-5: Review comments

Change-Id: Ic07ca01f8d876b6076951f31285718f8b355c123
JIRA: CPOUI5MODELS-106

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