Merge `TraceLayout` into `TraceInfo` #952

Job	Run time
Clippy	20s
Check with --all-features	26s
rustfmt	13s
Check with --no-default-features	21s
no-std (stable, wasm32-unknown-unknown)	31s
Test Rust stable on ubuntu	1m 8s
no-std (nightly, wasm32-unknown-unknown)	36s
Test Rust nightly on ubuntu	1m 13s
	4m 48s

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