Merge `TraceLayout` into `TraceInfo` #942

Job	Run time
Clippy	13s
no-std (stable, wasm32-unknown-unknown)	32s
rustfmt	13s
no-std (nightly, wasm32-unknown-unknown)	41s
Check with --all-features	25s
Test Rust stable on ubuntu	1m 19s
Test Rust nightly on ubuntu	1m 13s
Check with --no-default-features	24s
	5m 0s

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