title: How to get the current buffer path using neovim Lua API?
body: <p>I am using neovim 0.5 and want to write a custom function to use with <code>telescope.nvim</code>.</p>
  <p>I need to get the file path of the current buffer I execute the function. I have been unable to find how to do this in the nvim Lua API docs.</p>
  <p><code>vim.nvim_get_current_buf</code> gets the buffer number, how do I get the full file path of the current buffer?</p>