[feat]: support accept function as filetype value

[JuanZoran]

Sometimes it will be helpful to dynamically generate runner commands for different case

I think it should accept a function that returns a string as a runner command

maybe it also can accept some args like project name or etc...

[CRAG666]

That is already implemented, or maybe you refer to another functionality, but in any case you can assign functions in your file types, in fact in my dotfiles I do that, as for the projects it is possible to assign projects in the same way

[CRAG666]

@JuanZoran I currently use this for markdown

      markdown = function(...)
        markdownCompileOptions = {
          Normal = "pdf",
          Presentation = "beamer",
          Slides = "",
        }
        vim.ui.select(vim.tbl_keys(markdownCompileOptions), {
          prompt = "Select preview mode:",
        }, function(opt, _)
          if opt then
            if opt == "Slides" then
              local filename = vim.fn.expand "%:p"
              os.execute("kitty slides " .. filename .. " &> /dev/null &")
              return
            end
            require("code_runner.hooks.preview_pdf").run {
              command = "pandoc",
              args = { "$fileName", "-o", "$tmpFile", "-t", markdownCompileOptions[opt] },
              preview_cmd = "/bin/zathura --fork",
            }
          else
            print "Not Preview"
          end
        end)
      end,

[JuanZoran]

Thanks, I will read the code later, really a nice plugin!