feat(timezone)!: improves how pace handles timezones #530

Job	Run time
Clippy (stable)	16s
Clippy (Future) (beta)	2m 18s
Rustfmt	16s
Clippy (Future) (nightly)	2m 19s
Test (stable, macos-latest)	2m 31s
Test (stable, ubuntu-latest)	1m 37s
Test (stable, windows-latest)	3m 49s
Build docs (stable, macos-latest)	30s
Check MSRV (pace-rs, 1.74.1)	2m 34s
Test (beta, macos-latest)	4m 17s
Build docs (stable, ubuntu-latest)	25s
Check MSRV (pace_core, 1.74.1)	1m 54s
Build docs (stable, windows-latest)	1m 34s
Check MSRV (pace_cli, 1.74.1)	2m 1s
Test (beta, ubuntu-latest)	1m 33s
Test (beta, windows-latest)	3m 3s
ubuntu / stable / features	2m 22s
Result (CI)	1s
	33m 20s

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