Hide JsonSerializer interface from public API, export it to serializer implementations (#10688)

Author: alzimmermsft

sdk/core/azure-core-serializer-json-gson/src/main/java/com/azure/core/serializer/json/gson/GsonJsonSerializer.java

@@ -4,7 +4,7 @@
 package com.azure.core.serializer.json.gson;
 
 import com.azure.core.util.CoreUtils;
-import com.azure.core.util.serializer.JsonSerializer;
+import com.azure.core.implementation.serializer.JsonSerializer;
 import com.google.gson.Gson;
 
 import java.nio.charset.StandardCharsets;

sdk/core/azure-core-serializer-json-jackson/src/main/java/com/azure/core/serializer/json/jackson/JacksonJsonSerializer.java

@@ -4,7 +4,7 @@
 package com.azure.core.serializer.json.jackson;
 
 import com.azure.core.util.logging.ClientLogger;
-import com.azure.core.util.serializer.JsonSerializer;
+import com.azure.core.implementation.serializer.JsonSerializer;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 import java.io.IOException;

sdk/core/azure-core/src/main/java/com/azure/core/util/serializer/JsonSerializer.java renamed to sdk/core/azure-core/src/main/java/com/azure/core/implementation/serializer/JsonSerializer.java

@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-package com.azure.core.util.serializer;
+package com.azure.core.implementation.serializer;
 
 /**
  * Generic interface covering basic JSON serialization and deserialization methods.

sdk/core/azure-core/src/main/java/module-info.java

@@ -41,7 +41,11 @@
     // Exports HttpProviders#getAllHttpClients API to azure-core-test module
     exports com.azure.core.implementation.http to com.azure.core.test;
 
-  // service provider interfaces
+    // Exports JsonSerializer to azure-core-serializer-json-gson and azure-core-serializer-json-jackson
+    exports com.azure.core.implementation.serializer to com.azure.core.serializer.json.gson,
+        com.azure.core.serializer.json.jackson;
+
+    // Service Provider Interfaces
     uses com.azure.core.util.tracing.Tracer;
     uses com.azure.core.http.HttpClientProvider;
     uses com.azure.core.http.policy.BeforeRetryPolicyProvider;