fix: the GetBatch by id should be available (#262)

Author: mickaelMamani

src/Custom/Batch/BatchClient.Protocol.cs

@@ -104,7 +104,7 @@ public virtual CollectionResult GetBatches(string after, int? limit, RequestOpti
     /// <exception cref="ArgumentException"> <paramref name="batchId"/> is an empty string, and was expected to be non-empty. </exception>
     /// <exception cref="ClientResultException"> Service returned a non-success status code. </exception>
     /// <returns> The response returned from the service. </returns>
-    internal virtual async Task<ClientResult> GetBatchAsync(string batchId, RequestOptions options)
+    public virtual async Task<ClientResult> GetBatchAsync(string batchId, RequestOptions options)
     {
         Argument.AssertNotNullOrEmpty(batchId, nameof(batchId));
 
@@ -121,7 +121,7 @@ internal virtual async Task<ClientResult> GetBatchAsync(string batchId, RequestO
     /// <exception cref="ArgumentException"> <paramref name="batchId"/> is an empty string, and was expected to be non-empty. </exception>
     /// <exception cref="ClientResultException"> Service returned a non-success status code. </exception>
     /// <returns> The response returned from the service. </returns>
-    internal virtual ClientResult GetBatch(string batchId, RequestOptions options)
+    public virtual ClientResult GetBatch(string batchId, RequestOptions options)
     {
         Argument.AssertNotNullOrEmpty(batchId, nameof(batchId));