Fix RC Codable to handle arrays and dictionaries from plist defaults (#10046)

FirebaseSharedSwift/Sources/FirebaseRemoteConfigValueDecoding.swift

@@ -20,5 +20,6 @@ public protocol FirebaseRemoteConfigValueDecoding {
   func boolValue() -> Bool
   func stringValue() -> String
   func dataValue() -> Data
-  func jsonValue() -> [String: AnyHashable]?
+  func arrayValue() -> [AnyHashable]?
+  func dictionaryValue() -> [String: AnyHashable]?
 }