feat(timezone)!: improves how pace handles timezones #532

Job	Run time
Clippy (stable)	19s
Clippy (Future) (beta)	2m 18s
Build docs (stable, macos-latest)	38s
Clippy (Future) (nightly)	2m 15s
Build docs (stable, ubuntu-latest)	14s
Rustfmt	6s
Build docs (stable, windows-latest)	43s
Test (stable, macos-latest)	2m 37s
Test (stable, ubuntu-latest)	1m 36s
Test (stable, windows-latest)	3m 58s
Check MSRV (pace-rs, 1.74.1)	2m 43s
Test (beta, macos-latest)	2m 21s
Check MSRV (pace_core, 1.74.1)	1m 56s
Test (beta, ubuntu-latest)	1m 50s
Check MSRV (pace_cli, 1.74.1)	2m 26s
Test (beta, windows-latest)	3m 0s
ubuntu / stable / features	2m 29s
Result (CI)	0s
	31m 29s

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