Use a separate Task to init table

This might fix the issue we're facing (somewhat randomly) in Azure Functions.

Fixes #58 (hopefully)

Author: kzu

src/TableStorage/DocumentRepository`1.cs

@@ -275,13 +275,13 @@ async Task<T> PutStringAsync(T entity, CancellationToken cancellation = default)
 
         #endregion
 
-        async Task<CloudTable> GetTableAsync(string tableName)
+        Task<CloudTable> GetTableAsync(string tableName) => Task.Run(async () =>
         {
             var tableClient = storageAccount.CreateCloudTableClient();
             var table = tableClient.GetTableReference(tableName);
             await table.CreateIfNotExistsAsync();
             return table;
-        }
+        });
 
         class BinaryDocumentEntity : TableEntity, IDocumentEntity
         {

src/TableStorage/TableEntityRepository.cs

@@ -110,12 +110,12 @@ public async Task<ITableEntity> PutAsync(ITableEntity entity, CancellationToken
             return (ITableEntity)result.Result;
         }
 
-        async Task<CloudTable> GetTableAsync(string tableName)
+        Task<CloudTable> GetTableAsync(string tableName) => Task.Run(async () =>
         {
             var tableClient = storageAccount.CreateCloudTableClient();
             var table = tableClient.GetTableReference(tableName);
             await table.CreateIfNotExistsAsync();
             return table;
-        }
+        });
     }
 }

src/TableStorage/TableRepository`1.cs

@@ -164,13 +164,13 @@ public async Task<T> PutAsync(T entity, CancellationToken cancellation = default
             return ToEntity((DynamicTableEntity)result.Result);
         }
 
-        async Task<CloudTable> GetTableAsync(string tableName)
+        Task<CloudTable> GetTableAsync(string tableName) => Task.Run(async () =>
         {
             var tableClient = storageAccount.CreateCloudTableClient();
             var table = tableClient.GetTableReference(tableName);
             await table.CreateIfNotExistsAsync();
             return table;
-        }
+        });
 
         /// <summary>
         /// Uses JSON deserialization to convert from the persisted entity data