[O] [Proposal] Make header argument :mkdirp yes work for other header arguments not just :tangle

[Christopher M. Miles]

I hope `:mkdirp` header argument can also work for other related header
arguments like `:dir`, `:file` etc not just `:tangle`. Like following
example.

#+begin_src sh :mkdirp yes :dir "data/code/mkdirp/dir" :file "test" :results 
file link
echo "hello"
#+end_src

Do you have any idea about this?

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