fix: pre-compile visitable classes regex pattern (#17280) (#17281)

Pre compiles the regex pattern to improve build frontend performance
during the bytecode scan and collection of reachable classes.
Also adds some package exclusions for well knonw libraries that should
not be visited.

Part of #17234

Co-authored-by: Marco Collovati <marco@vaadin.com>

flow-server/src/main/java/com/vaadin/flow/server/frontend/scanner/FrontendDependencies.java

@@ -32,6 +32,7 @@
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;
+import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -73,6 +74,19 @@
  */
 public class FrontendDependencies extends AbstractDependenciesScanner {
 
+    //@formatter:off
+    private static final Pattern VISITABLE_CLASS_PATTERN = Pattern.compile("(^$|"
+            + ".*(slf4j).*|"
+            // #5803
+            + "^(java|sun|oracle|elemental|javax|jakarta|oshi|"
+            + "org\\.(apache|atmosphere|jsoup|jboss|w3c|spring|joda|hibernate|glassfish|hsqldb|osgi|jooq)|"
+            + "com\\.(helger|spring|gwt|lowagie|fasterxml|sun|nimbusds|googlecode)|"
+            + "net\\.(sf|bytebuddy)"
+            + ").*|"
+            + ".*(Exception)$"
+            + ")");
+    //@formatter:on
+
     private final HashMap<String, EntryPointData> entryPoints = new LinkedHashMap<>();
     private ThemeDefinition themeDefinition;
     private AbstractTheme themeInstance;
@@ -764,15 +778,8 @@ private boolean shouldVisit(String className) {
         // factories. This is the reason of having just a blacklist of some
         // common name-spaces that would not have components.
         // We also exclude Feature-Flag classes
-        return className != null && // @formatter:off
-                !isExperimental(className) &&
-                !className.matches(
-                    "(^$|"
-                    + ".*(slf4j).*|"
-                    // #5803
-                    + "^(java|sun|elemental|javax|jakarta|oshi|org.(apache|atmosphere|jsoup|jboss|w3c|spring|joda|hibernate|glassfish|hsqldb)|com.(helger|spring|gwt|lowagie|fasterxml|sun|nimbusds)|net.(sf|bytebuddy)).*|"
-                    + ".*(Exception)$"
-                    + ")"); // @formatter:on
+        return className != null && !isExperimental(className)
+                && !VISITABLE_CLASS_PATTERN.matcher(className).matches();
     }
 
     private URL getUrl(String className) {