feat: move debug logging behind an environment variable (#972) #1152

Job	Run time
MSRV (ubuntu-latest)	26s
Test (stable)	21s
MSRV (windows-latest)	39s
Test (beta)	38s
Clippy	9s
Test build-std (aarch64-tvos)	2m 49s
Test (nightly)	25s
Test build-std (aarch64-tvos-sim)	2m 21s
Test (linux32)	1m 6s
Test CUDA support	37s
Test build-std (x86_64-tvos)	2m 20s
Rustfmt	4s
Test (macos)	3m 11s
Test (aarch64-macos)	36s
Test (aarch64-ios)	55s
Test (win32)	1m 28s
Test (win64)	2m 20s
Test (mingw32)	1m 33s
Test (mingw64)	1m 44s
Test (windows-2019)	3m 27s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 11s
	29m 20s

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