[INTERNAL] sap.uxap.ObjectPageLayout - suppress layout calculations
[INTERNAL] sap.uxap.ObjectPageLayout - suppress layout calculations

The method _adjustLayoutAndUxRules is called whenever an object page section/subsection is mutated.
This method does heavy calculations (anchor bar rebuilding, memory management, etc...)
In scenarios where a lot of changes to all sections/subsections occur at once,
the method is called many times in a row, lowering performance.
To address this, the change introduces an "sap-restricted" API that allows the developer
to suppress layout calculations when they know a lot of changes will occur (e.g. model rebinding)
and do them manually once, after all such changes are done.

Change-Id: I8599fd0151491d98a4ed318dce9c0e2f0450f7b5

cschuff/openui5,nzamani/openui5,cschuff/openui5,olirogers/openui5,SAP/openui5,nzamani/openui5,olirogers/openui5,cschuff/openui5,nzamani/openui5,SAP/openui5,SQCLabs/openui5,SQCLabs/openui5,SAP/openui5,olirogers/openui5,SQCLabs/openui5,SAP/openui5