[INTERNAL] core library.js: Adds lazy stubs for static Fragment functions
[INTERNAL] core library.js: Adds lazy stubs for static Fragment functions

- byId and createId where not stubbed before

Change-Id: Ic3a8078b7bcbc1744214c3a1a9500f2f86026510

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