Merge `TraceLayout` into `TraceInfo` #928

Job	Run time
rustfmt	17s
Check with --all-features	25s
Clippy	24s
Check with --no-default-features	23s
no-std (stable, wasm32-unknown-unknown)	31s
Test Rust stable on ubuntu	1m 11s
no-std (nightly, wasm32-unknown-unknown)	37s
Test Rust nightly on ubuntu	1m 14s
	5m 2s

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