Merge `TraceLayout` into `TraceInfo` #935

Job	Run time
rustfmt	17s
Clippy	14s
no-std (stable, wasm32-unknown-unknown)	35s
Check with --all-features	37s
no-std (nightly, wasm32-unknown-unknown)	36s
Check with --no-default-features	23s
Test Rust stable on ubuntu	1m 17s
Test Rust nightly on ubuntu	1m 16s
	5m 15s

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