WIP: feat: `aggregate-timings-from-log` subcmd. #363

Job	Run time
block-autosquash-commits	0s
cargo-deny	18s
Rustfmt (stable)	14s
Check (ubuntu-latest, stable)	36s
Check (ubuntu-latest, beta)	38s
Check (windows-latest, stable)	1m 28s
Check (windows-latest, beta)	1m 34s
Check (macOS-latest, stable)	37s
Check (macOS-latest, beta)	40s
Test Suite (ubuntu-latest, stable)	1m 2s
Clippy (stable)	37s
Test Suite (ubuntu-latest, beta)	1m 1s
Documentation (stable)	34s
Test Suite (windows-latest, stable)	2m 17s
Clippy (beta)	36s
Documentation (beta)	32s
Test Suite (windows-latest, beta)	2m 0s
Test Suite (macOS-latest, stable)	1m 5s
Test Suite (macOS-latest, beta)	1m 5s
	16m 54s

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