modules/hardware: add paddles

[appsforartists]

Here's a draft at adding support for Steam Deck-style controllers that don't have kernel support (like the Steam Deck does). It just enables handheld-daemon, but it's nice to get it automatically for devices that need it (like the Legion Go).

I'll rebase it on #450 when that merges.

I don't know your code style - when to use lowercase vs caps, and if small modules should be in loose files like paddles.nix, or in folders paddles/default.nix. Let me know if I need to make any changes there, or anywhere else.

[appsforartists]

cc @toast003

[K900]

I want to see where Valve goes with the native Steam Input support before adding something like this.