Add support for xlsx and pdf downloads

[crazycapivara]

See downloads

• xlsx
• pdf

[j0bekt01]

you can do xlsx like this:
ui.tags.script(type="text/javascript", src="https://oss.sheetjs.com/sheetjs/xlsx.full.min.js")

async with TabulatorContext("tabulator") as table: table.trigger_download("xlsx", "data.xlsx", {"sheetName":"sheetName"})

[crazycapivara]

@j0bekt01 Yes, this is already implemented with use_sheetjs as shown in this example.

Issue is still open because of the pdf support. Maybe I will split the issues.