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>

apps/nesgamepad/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "nesgamepad"
+version = "0.1.0"
+description = "Turns the controllers plugged into a client into input devices inside the box"
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+
+[dependencies]
+anyhow.workspace = true
+clap.workspace = true
+libc.workspace = true
+tokio.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+
+nesprotocol = { path = "../../crates/nesprotocol" }