vim-patch:9.1.1552: [security]: path traversal issue in tar.vim

Problem:  [security]: path traversal issue in tar.vim
          (@ax)
Solution: warn the user for such things, drop leading /, don't
          forcefully overwrite files when writing temporary files,
          refactor autoload/tar.vim

tar.vim: drop leading / in path names

A tar archive containing files with leading `/` may cause confusions as
to where the content is extracted.  Let's make sure we drop the leading
`/` and use a relative path instead.

Also while at it, had to refactor it quite a bit and increase the
minimum supported Vim version to v9. Also add a test for some basic tar
functionality

closes: vim/vim#17733

https://github.com/vim/vim/commit/87757c6b0a4b2c1f71c72ea8e1438b8fb116b239

Co-authored-by: Christian Brabandt <cb@256bit.org>

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