support for xlsx

[fjperini]

A solution to XLSX support!

It works perfectly, it generates the file in .xls format, using the blobType:

 exportCSV={{
                        fileName: "fie_name.xlsx",
                        blobType:
                          "data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=UTF-8"
                      }}

[fredericdasilva]

Hi,
I am very interested about this xlsx support feature. When this PR can be merged ?

[avindra]

7 - 15 mb for xlsx

https://packagephobia.com/result?p=xlsx

probably shouldn't include a dep this big