Added method to build change column definition (#1110)

Author: aidanharan

lib/active_record/connection_adapters/sqlserver/schema_statements.rb

@@ -221,6 +221,12 @@ def remove_index!(table_name, index_name)
           execute "DROP INDEX #{quote_column_name(index_name)} ON #{quote_table_name(table_name)}"
         end
 
+        def build_change_column_definition(table_name, column_name, type, **options) # :nodoc:
+          td = create_table_definition(table_name)
+          cd = td.new_column_definition(column_name, type, **options)
+          ChangeColumnDefinition.new(cd, column_name)
+        end
+
         def build_change_column_default_definition(table_name, column_name, default_or_changes) # :nodoc:
           column = column_for(table_name, column_name)
           return unless column