feature: skip to next file in the trouble window

[simonmandlik]

Did you check the docs?

• [X] I have read all the trouble.nvim docs

Is your feature request related to a problem? Please describe.

Really sorry I would like to reopen this becuase there seems to be no way to do it in v3.

Describe the solution you'd like

Complement

require("trouble").next(opts)
require("trouble").prev(opts)
require("trouble").first(opts)
require("trouble").last(opts)

with

require("trouble").next_file(opts)
require("trouble").prev_file(opts)