fix(mssql): implement GetSchemaTable in DataReader for DataTable.Load support

Author: vkuttyp

Directory.Build.props

@@ -7,6 +7,6 @@
     <Authors>vkuttyp</Authors>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <RepositoryUrl>https://github.com/vkuttyp/CosmoSQLClient-Dotnet</RepositoryUrl>
-    <Version>1.5.4</Version>
+    <Version>1.5.5</Version>
   </PropertyGroup>
 </Project>

src/CosmoSQLClient.MsSql/MsSqlDataReader.cs

@@ -101,6 +101,33 @@ public override Type GetFieldType(int ordinal)
         };
     }
 
+    public override DataTable GetSchemaTable()
+    {
+        var dt = new DataTable("SchemaTable");
+        dt.Columns.Add("ColumnName",       typeof(string));
+        dt.Columns.Add("ColumnOrdinal",    typeof(int));
+        dt.Columns.Add("ColumnSize",       typeof(int));
+        dt.Columns.Add("NumericPrecision", typeof(short));
+        dt.Columns.Add("NumericScale",     typeof(short));
+        dt.Columns.Add("DataType",         typeof(Type));
+        dt.Columns.Add("AllowDBNull",      typeof(bool));
+
+        var cols = CurrentSetColumns;
+        if (cols != null)
+        {
+            for (int i = 0; i < cols.Count; i++)
+            {
+                var row = dt.NewRow();
+                row["ColumnName"]    = cols[i].Name;
+                row["ColumnOrdinal"] = i;
+                row["DataType"]      = GetFieldType(i);
+                row["AllowDBNull"]   = cols[i].IsNullable;
+                dt.Rows.Add(row);
+            }
+        }
+        return dt;
+    }
+
     // ── Value accessors ───────────────────────────────────────────────────────
 
     public override bool IsDBNull(int ordinal) => Get(ordinal) is SqlValue.Null;