B-48943 - Update api-validator configuration to match translation when configuration xsl-engine

Updating the Config object to accept the following
 - select XSD engine as "Xerces" or "SaxonEE" (Config.setXSDEngine)
 - select XSL engine as "Xalan", "XalanC", "SaxonHE" or "SaxonEE" (Config.setXSLEngine)

Deprecated the following
 - Config.setUseSaxonEEValidation
 - Config.getUseSaxonEEValidation
 - Config.useSaxonEEValidation