Merge `TraceLayout` into `TraceInfo` #940

Job	Run time
rustfmt	12s
no-std (stable, wasm32-unknown-unknown)	31s
Clippy	13s
Check with --all-features	26s
no-std (nightly, wasm32-unknown-unknown)	40s
Check with --no-default-features	27s
Test Rust stable on ubuntu	1m 12s
Test Rust nightly on ubuntu	1m 13s
	4m 54s

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