feat(timezone): improve ux and time zone handling #560

Job	Run time
Clippy (stable)	23s
Rustfmt	10s
Test (stable, macos-latest)	1m 16s
Test (stable, ubuntu-latest)	1m 0s
Clippy (Future) (beta)	21s
Clippy (Future) (nightly)	40s
Test (stable, windows-latest)	1m 30s
Build docs (stable, macos-latest)	35s
Test (beta, macos-latest)	1m 31s
Build docs (stable, ubuntu-latest)	18s
Build docs (stable, windows-latest)	1m 27s
Test (beta, ubuntu-latest)	55s
Test (beta, windows-latest)	59s
Check MSRV (pace-rs, 1.74.1)	2m 7s
ubuntu / stable / features	1m 53s
Check MSRV (pace_core, 1.74.1)	2m 0s
Check MSRV (pace_cli, 1.74.1)	1m 58s
Result (CI)	0s
	19m 3s

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