replace Table class with Table2

[epogrebnyak]

• [ ] Table2 should be renamed to Table and pass tests
• [ ] tests for DataBlock and HeaderParser must pass be recycled from existign tests

https://github.com/mini-kep/parser-rosstat-kep/blob/a8e68c19cb570cf929478e94a48ff9924f4318e0/src/kep/csv2df/parser.py#L88-L231