Merge `TraceLayout` into `TraceInfo` #943

Job	Run time
rustfmt	23s
Clippy	13s
no-std (stable, wasm32-unknown-unknown)	31s
Check with --all-features	43s
no-std (nightly, wasm32-unknown-unknown)	38s
Check with --no-default-features	38s
Test Rust stable on ubuntu	1m 13s
Test Rust nightly on ubuntu	1m 12s
	5m 31s

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