[dynamic control] add jsonkeyvalue source (#2702)

Author: jackshirazi

dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/source/SourceFormat.java

@@ -13,7 +13,8 @@
 /** Supported source formats and their parser dispatch. */
 public enum SourceFormat {
   KEYVALUE("keyvalue", KeyValueSourceWrapper::parse),
-  JSON("json", JsonSourceWrapper::parse);
+  JSON("json", JsonSourceWrapper::parse), // Will remove
+  JSONKEYVALUE("jsonkeyvalue", JsonSourceWrapper::parse);
 
   private final String configValue;
   private final SourceParser parser;