Merge `TraceLayout` into `TraceInfo` #934

Job	Run time
rustfmt	15s
Clippy	13s
no-std (stable, wasm32-unknown-unknown)	42s
Check with --all-features	24s
no-std (nightly, wasm32-unknown-unknown)	39s
Check with --no-default-features	23s
Test Rust stable on ubuntu	1m 14s
Test Rust nightly on ubuntu	1m 13s
	5m 3s

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