Mark client side encryption package as beta

JAVA-3071
JAVA-3377

Author: rozza

driver-async/src/main/com/mongodb/async/client/vault/package-info.java

@@ -17,9 +17,14 @@
 /**
  * This package contains the Key Vault API
  *
+ * <p>
+ * Note: support for client-side encryption is in beta.  Backwards-breaking changes may be made before the final release.
+ * </p>
  * @since 3.11
  */
+@Beta
 @NonNullApi
 package com.mongodb.async.client.vault;
 
+import com.mongodb.annotations.Beta;
 import com.mongodb.lang.NonNullApi;

driver-core/src/main/com/mongodb/annotations/Beta.java

@@ -44,6 +44,7 @@
         ElementType.CONSTRUCTOR,
         ElementType.FIELD,
         ElementType.METHOD,
+        ElementType.PACKAGE,
         ElementType.TYPE })
 @Documented
 @Beta

driver-sync/src/main/com/mongodb/client/vault/package-info.java

@@ -17,9 +17,14 @@
 /**
  * This package contains the Key Vault API
  *
+ * <p>
+ * Note: support for client-side encryption is in beta.  Backwards-breaking changes may be made before the final release.
+ * </p>
  * @since 3.11
  */
+@Beta
 @NonNullApi
 package com.mongodb.client.vault;
 
+import com.mongodb.annotations.Beta;
 import com.mongodb.lang.NonNullApi;