Merge `TraceLayout` into `TraceInfo` #953

Job	Run time
Clippy	24s
rustfmt	15s
Check with --all-features	26s
no-std (stable, wasm32-unknown-unknown)	35s
Check with --no-default-features	23s
Test Rust stable on ubuntu	1m 18s
no-std (nightly, wasm32-unknown-unknown)	36s
Test Rust nightly on ubuntu	1m 14s
	5m 11s

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