[wgpu-hal]: MVP no_std support (#7599)

* MVP `no_std` support in `wgpu-hal`

* Update CHANGELOG.md

* Fix visibility

* Fix unused imports

* Response to feedback

Co-Authored-By: Connor Fitzgerald <connorwadefitzgerald@gmail.com>

* Update other `validation_canary` usages

Co-Authored-By: Connor Fitzgerald <connorwadefitzgerald@gmail.com>

---------

Co-authored-by: Connor Fitzgerald <connorwadefitzgerald@gmail.com>

examples/features/Cargo.toml

@@ -45,6 +45,7 @@ png.workspace = true
 pollster.workspace = true
 web-time.workspace = true
 wgpu-types = { workspace = true, features = [
+    "std",
     "trace", # TODO(#5974): this should be a dep on wgpu/trace and not wgpu-types at all
 ] }
 winit.workspace = true