Add bevy 0.18 game engine with fixups for all sub-crates

Summary:
Imports the bevy 0.18.1 game engine and wgpu-types 27 into third-party/rust.

This is a standalone import — D98494278 (bevy 0.14) remains in Phabricator for historical reference but is not a dependency of this diff.

**New top-level crates added to Cargo.toml:**
- `bevy = "0.18"` (game engine framework)
- `wgpu-types = { version = "27", features = ["serde"] }` (GPU API types)

**Vendored sub-crates (56 bevy + ~30 transitive deps):**
- 56 bevy sub-crates: bevy_ecs, bevy_render, bevy_pbr, bevy_gltf, bevy_animation, bevy_text, bevy_ui, bevy_scene, bevy_camera, bevy_image, bevy_mesh, bevy_shader, bevy_platform, and 43 others
- Key new transitive deps: cosmic-text (text shaping), skrifa/swash/read-fonts (font rendering), naga_oil (shader composition), rodio/cpal/alsa (audio), taffy (UI layout), self_cell, atomicow, variadics_please
- Upgraded shared deps: accesskit 0.14->0.21, wgpu-types 0.20->27, sysinfo 0.30->0.37

**Fixups (77 fixup configs across 5 categories):**
- `cargo_env` + `extra_srcs` for 50+ bevy sub-crates (embedded assets, shader files, Cargo.toml metadata)
- `omit_features` on bevy/bevy_internal: removes `bevy_winit` and windowing features (x11, wayland, custom_cursor, android-game-activity) -- bevy_winit pulls in conflicting android-activity features
- `omit_features` on android-activity: removes `game-activity` to resolve mutual exclusion with `native-activity` used by existing arvr targets (haptic_sdk, eye_tracking)
- `omit_features` on bevy_reflect: removes `web` on wasm32 to prevent uuid/js activation incompatible with Buck wasm build
- `omit_features` on uuid: removes `js` on wasm32 (same wasm-bindgen incompatibility)
- Build script and overlay fixups for wgpu, wgpu-core, wgpu-hal, winit, cpal, alsa-sys, oboe-sys, hassle-rs

**First-party changes:**
- `xplat/bevy_demo/`: 74 example files migrated to bevy 0.18 API (required components pattern, `delta_secs()`, `DefaultPlugins` without `WinitPlugin`)
- Added Meta license headers to all 74 example files

allow-large-files
bypass-github-export-checks

Reviewed By: dtolnay

Differential Revision: D101469697

fbshipit-source-id: 1174cec5ea8655b196e2188ccabd90662c0f549f

Author: tkaleas

safeptrace/Cargo.toml

@@ -14,7 +14,7 @@ futures = { version = "0.3.31", features = ["async-await", "compat"] }
 lazy_static = "1.5"
 libc = "0.2.183"
 nix = { version = "0.30.1", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "signal", "term", "time", "user", "zerocopy"] }
-parking_lot = { version = "0.12.1", features = ["send_guard"] }
+parking_lot = { version = "0.12.1", features = ["arc_lock", "send_guard"] }
 reverie-memory = { version = "0.1.0", path = "../reverie-memory", optional = true }
 reverie-process = { version = "0.1.0", path = "../reverie-process" }
 syscalls = { version = "0.6.18", features = ["serde"] }