wgpu_core: Add logging to Instance::new. #7621

Job	Run time
Run `cargo deny check`	3s
Run `cargo deny check advisories`	1s
Clippy Windows x86_64	4m 7s
Clippy MacOS x86_64	3s
Clippy MacOS aarch64	3s
Clippy IOS aarch64	2m 50s
Clippy Linux x86_64	1m 37s
Clippy Linux aarch64	2m 1s
Clippy Android aarch64	1m 30s
Clippy WebAssembly	3s
Clippy Emscripten	1m 17s
Doctest	3s
Clippy cts_runner	1s
Format	1s
Test Windows x86_64	10m 31s
Test Mac aarch64	1m 35s
Test Linux x86_64	6m 43s
Test WebAssembly	6m 15s
	38m 44s

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