Option to select Letter Head for excel export

[tsothun]

When export to excel there is only a raw data output.
There should be a Letter Head to select like Print and PDF and format of table should go along too.
When export only raw data to excel it consumes so much time to redesign the format again in excel like table , footer , signature in different languages.

ERPNext: v13.37.0 (version-13)

Frappe Framework: v13.40.0 (version-13)