fix: add perl af

[rwxrob]

This simply allows code like the following to be added to init.lua to enable any of the useful af key mapping combinations (vaf, yaf, daf, gcaf,!af), :

-- requires >0.11
require("nvim-treesitter-textobjects").setup({
  select = {
    lookahead = true,
  },
})

vim.keymap.set({ "x", "o" }, "af", function()
  require("nvim-treesitter-textobjects.select").select_textobject("@function.outer", "textobjects")
end)

vim.keymap.set({ "x", "o" }, "if", function()
  require("nvim-treesitter-textobjects.select").select_textobject("@function.inner", "textobjects")
end)

And yes, there is still a lot of perl out there. 🤪