Add a option to csv2xlsx for output number as Text or number

[zuisong]

Prerequisites

• make sure you're are using the latest version by csvtk version
• read the usage

Describe your issue

• describe the problem
• provide a reproducible example

Thank you

$ echo 8911111111111111111111111173 | csvtk  -H csv2xlsx -o /tmp/tempfile  &&  csvtk xlsx2csv   /tmp/tempfile
8911111111111111000000000000

output has lost some text.

Maybe we can add a option to csv2xlsx control output number as Text or number.
It seems like

$ echo 8911111111111111111111111173 | csvtk  -H csv2xlsx --number-as-text -o /tmp/tempfile  &&  csvtk xlsx2csv   /tmp/tempfile
8911111111111111111111111173

[zuisong]

Link issue: #192

[shenwei356]

oh, right, it should be optional.

[shenwei356]

Added a flag.

  -f, --format-numbers   save numbers in number format, instead of text

csvtk_linux_amd64.tar.gz