refactor: make asBoolean public (#2537)

Signed-off-by: Chris Laprun <[email protected]>

Author: metacosm

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/dependent/kubernetes/BooleanWithUndefined.java

@@ -6,7 +6,7 @@
 public enum BooleanWithUndefined {
   TRUE, FALSE, UNDEFINED;
 
-  Boolean asBoolean() {
+  public Boolean asBoolean() {
     switch (this) {
       case TRUE:
         return Boolean.TRUE;