[FIX] jquery.sap.unicode: improved jQuery.sap.isStringNFC performance
[FIX] jquery.sap.unicode: improved jQuery.sap.isStringNFC performance

- on IE the performance of normalization is poor
- checking for ascii exclusive strings improves performance tremendously

Change-Id: I84178c54bfc6152529716f925f5a393b269b9563
BCP: 1670013980

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