Add async overload for columns+values insert

SqlKata.Execution/Query.Extensions.cs

@@ -168,6 +168,11 @@ public static int Insert(this Query query, IEnumerable<string> columns, IEnumera
  return CreateQueryFactory(query).Execute(query.AsInsert(columns, valuesCollection), transaction, timeout);
  }
 
+ public static async Task<int> InsertAsync(this Query query, IEnumerable<string> columns, IEnumerable<IEnumerable<object>> valuesCollection, IDbTransaction transaction = null, int? timeout = null)
+ {
+ return await CreateQueryFactory(query).ExecuteAsync(query.AsInsert(columns, valuesCollection), transaction, timeout);
+ }
+
  public static int Insert(this Query query, IEnumerable<string> columns, Query fromQuery, IDbTransaction transaction = null, int? timeout = null)
  {
  return CreateQueryFactory(query).Execute(query.AsInsert(columns, fromQuery), transaction, timeout);