fix: circular calling on GetResponse::found

Adds a new interface `GetResponseFound` to solve the previous
implementation's circular calling on `GetResponse::found`.

Previously
this method returned a `GetResponse.Found`, so on a response of this
type, a caller could write
`response.found().get().found().get().found()...` ad infinitum. This
was not desirable.

To solve this we introduce a new interface `GetResponseFound` which
`GetResponse.Found` implements. This way `GetResponse::found` returns
an `Optional.of` an object implementing that, which cuts the cycle.

momento-sdk/src/main/java/momento/sdk/responses/storage/GetResponse.java

@@ -27,7 +27,7 @@ public interface GetResponse {
    *
    * @return The success response, or an empty optional if the operation failed.
    */
-  Optional<Found> found();
+  Optional<GetResponseFound> found();
 
   /**
    * A successful get operation.
@@ -38,7 +38,7 @@ public interface GetResponse {
    * <p>Use the appropriate type-based accessor on the value to retrieve the value in its
    * corresponding type.
    */
-  class Found implements GetResponse {
+  class Found implements GetResponse, GetResponseFound {
     private final StorageValue value;
 
     private Found(StorageValue value) {
@@ -71,7 +71,7 @@ public StorageValue value() {
     }
 
     @Override
-    public Optional<Found> found() {
+    public Optional<GetResponseFound> found() {
       return Optional.of(this);
     }
 
@@ -85,7 +85,7 @@ class NotFound implements GetResponse {
     public NotFound() {}
 
     @Override
-    public Optional<Found> found() {
+    public Optional<GetResponseFound> found() {
       return Optional.empty();
     }
 
@@ -112,7 +112,7 @@ public Error(SdkException cause) {
     }
 
     @Override
-    public Optional<Found> found() {
+    public Optional<GetResponseFound> found() {
       return Optional.empty();
     }
 

momento-sdk/src/main/java/momento/sdk/responses/storage/GetResponseFound.java

@@ -0,0 +1,5 @@
+package momento.sdk.responses.storage;
+
+public interface GetResponseFound {
+  StorageValue value();
+}