tsvkit join allows adding file name as header

[dawnmy]

When tsvkit join files with two columns and no header row (or when the current header is not needed for the output), we can use the input file name or its basename (without the extension) as the column name for the value column of each file in the output file.

tsvkit join -f 1 --add-header "{name}"/"{base}"/"{dirname}"

and "{base:}" base name without any extension, "{base.}" base name without last extension