added Internal annotation

Author: slisaasquatch

src/main/java/com/saasquatch/jsonschemainferrer/annotations/Beta.java

@@ -9,6 +9,7 @@
  * @author sli
  */
 @Retention(RetentionPolicy.SOURCE) // Only used for documentation
+@Internal
 public @interface Beta {
 
 }

src/main/java/com/saasquatch/jsonschemainferrer/annotations/Internal.java

@@ -0,0 +1,16 @@
+package com.saasquatch.jsonschemainferrer.annotations;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * Indicates that an element is considered internal and should not be used externally regardless of
+ * its actual visibility.
+ *
+ * @author sli
+ */
+@Retention(RetentionPolicy.SOURCE) // Only used for documentation
+@Internal // This annotation itself is internal
+public @interface Internal {
+
+}

src/main/java/com/saasquatch/jsonschemainferrer/annotations/VisibleForTesting.java

@@ -9,6 +9,7 @@
  * @author sli
  */
 @Retention(RetentionPolicy.SOURCE) // Only used for documentation
+@Internal
 public @interface VisibleForTesting {
 
 }