feat(babel): add directory creation support with :mkdirp header argument (#928)

* feat(babel): add directory creation support with :mkdirp header argument

When tangling code blocks to files, automatically create parent directories
when the :mkdirp header argument is set to 'yes'.

* fix(babel): remove debug message

* fix(babel): replace double quotes with single quotes.

Coding style requires single quotes

Author: SjB

lua/orgmode/babel/tangle.lua

@@ -54,6 +54,12 @@ function Tangle:tangle()
         end
       end
     end
+
+    if info.header_args[':mkdirp'] == 'yes' then
+      local path = vim.fn.fnamemodify(info.filename, ':h')
+      vim.fn.mkdir(path, 'p')
+    end
+
     if info.name then
       block_content_by_name[info.name] = parsed_content
     end