Java 17 features (#15493)

- add missing @override
- Java style array syntax
- remove redundant modifiers
- always move String constants to left side in comparisons
- simplify lambda expressions and return statements
- use replace instead of replaceAll w/o regex

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

bundles/org.openhab.transform.regex/src/main/java/org/openhab/transform/regex/internal/RegExTransformationService.java

@@ -56,7 +56,7 @@ public class RegExTransformationService implements TransformationService {
             String regex = substMatcher.group(1);
             String substitution = substMatcher.group(2);
             String options = substMatcher.group(3);
-            if (options.equals("g")) {
+            if ("g".equals(options)) {
                 result = source.trim().replaceAll(regex, substitution);
             } else {
                 result = source.trim().replaceFirst(regex, substitution);