feat: make it possible to replace existing configuration

Author: metacosm

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/AbstractConfigurationService.java

@@ -17,10 +17,21 @@ public AbstractConfigurationService(Version version) {
   }
 
   protected <R extends CustomResource> void register(ControllerConfiguration<R> config) {
+    put(config, true);
+  }
+
+  protected <R extends CustomResource> void replace(ControllerConfiguration<R> config) {
+    put(config, false);
+  }
+
+  private <R extends CustomResource> void put(ControllerConfiguration<R> config,
+      boolean failIfExisting) {
     final var name = config.getName();
-    final var existing = configurations.get(name);
-    if (existing != null) {
-      throwExceptionOnNameCollision(config.getAssociatedControllerClassName(), existing);
+    if (failIfExisting) {
+      final var existing = configurations.get(name);
+      if (existing != null) {
+        throwExceptionOnNameCollision(config.getAssociatedControllerClassName(), existing);
+      }
     }
     configurations.put(name, config);
   }