download example table in xlsx

[qjiang002]

This PR is related to issue #503

Download example table of fine-grained analysis

• Add a download button above the table

• Download the entire table (page 1-5) into a xlsx file.

Note: the CSV format is not supported now because the react-csv package is not compatible with @type/react='^17.x' used in the frontend now. antd-table-export package only supports xlsx format.