feat: controller/gamepad support (#350)

Adds `nesgamepad`, basically "diet-coke vimputti" for Nestri's microVM
needs here.

Comes with direct mapping for:
- Sony
  - DualShock 4 (v2), DualSense
- Microsoft
  - Xbox 360 pad, Xbox One S pad
- Nintendo
  - Pro Controller
- Generic pad for unknown controllers

---------

Co-authored-by: DatCaptainHorse <DatCaptainHorse@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Cargo.lock

@@ -2361,6 +2361,19 @@ dependencies = [
  "ureq",
 ]
 
+[[package]]
+name = "nesgamepad"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "clap",
+ "libc",
+ "nesprotocol",
+ "tokio",
+ "tracing",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "neshub"
 version = "0.2.0"