Merge `TraceLayout` into `TraceInfo` #933

Job	Run time
Clippy	17s
Check with --all-features	24s
no-std (stable, wasm32-unknown-unknown)	34s
rustfmt	16s
Check with --no-default-features	29s
Test Rust stable on ubuntu	1m 17s
no-std (nightly, wasm32-unknown-unknown)	35s
Test Rust nightly on ubuntu	1m 9s
	5m 1s

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