Merge `TraceLayout` into `TraceInfo` #936

Job	Run time
rustfmt	12s
Clippy	13s
no-std (stable, wasm32-unknown-unknown)	34s
Check with --all-features	23s
Test Rust stable on ubuntu	1m 17s
Check with --no-default-features	25s
Test Rust nightly on ubuntu	1m 16s
no-std (nightly, wasm32-unknown-unknown)	37s
	4m 57s

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