Create a new web-facesconfig.xsd schema for JSF 2.3

I noticed that the schema file web-facesconfig.xsd has not been updated since JSF 2.1.

The following spec issue was opened to add the element /faces-config/factory/client-window-factory in the schema because it was missing on JSF 2.2.

https://github.com/javaee/javaserverfaces-spec/issues/1241

I also noticed that the following new elements need to be added to the JSF 2.3 schema.

/faces-config/factory/search-expression-context-factory
/faces-config/application/search-expression-handler
/faces-config/application/search-keyword-resolver

We need to create a new web-facesconfig.xsd schema for JSF 2.3