Add encodedList type in context.

Align with vc-bitstring-status-list repository.

Author: davidlehn

contexts/credentials/v2

@@ -206,8 +206,10 @@
 
         "statusPurpose":
           "https://www.w3.org/ns/credentials/status#statusPurpose",
-        "encodedList":
-          "https://www.w3.org/ns/credentials/status#encodedList",
+        "encodedList": {
+          "@id": "https://www.w3.org/ns/credentials/status#encodedList",
+          "@type": "https://w3id.org/security#multibase"
+        },
         "ttl": "https://www.w3.org/ns/credentials/status#ttl",
         "statusReference": "https://www.w3.org/ns/credentials/status#statusReference",
         "statusSize": "https://www.w3.org/ns/credentials/status#statusSize",