[refactor] remove commons-lang3 dependency from 2 core classes

- Eval.java and AppRestoreUtils

Author: line-o

exist-core/src/main/java/org/exist/backup/restore/AppRestoreUtils.java

@@ -21,7 +21,6 @@
  */
 package org.exist.backup.restore;
 
-import org.apache.commons.lang3.StringUtils;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.exist.Namespaces;
@@ -141,7 +140,7 @@ public void startElement(String uri, String localName, String qName, Attributes
                             if (PKG_NAMESPACE.equals(uri) && "package".equals(localName)) {
                                 final String version = attributes.getValue("version");
                                 final String name = attributes.getValue("name");
-                                if (StringUtils.isEmpty(version) || StringUtils.isEmpty(name)) {
+                                if (version.isEmpty() || name.isEmpty()) {
                                     LOG.warn("Invalid package descriptor for {}", app.getSymbolicPath());
                                     return;
                                 }

exist-core/src/main/java/org/exist/xquery/functions/util/Eval.java

@@ -78,7 +78,6 @@
 import org.xml.sax.XMLReader;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
-import static org.apache.commons.lang3.StringUtils.isNotEmpty;
 import static org.exist.xquery.FunctionDSL.*;
 import static org.exist.xquery.functions.util.UtilModule.functionSignatures;