Rewite caching in `local::unix` module - #1457

Draft

pitdicker wants to merge 17 commits into

chronotope:mainfrom

pitdicker:unix_tz_search

Commits on Mar 22, 2024

Factor out `Cache::refresh_cache`
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51de6d8
Factor out `Cache::needs_update`
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036d1ab
Compare mtime of `/etc/localtime` against `Cache::last_checked`
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1254be7
Simplify `Cache::needs_update`
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d2bcf71
Const initialize `TZ_INFO`
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ff5f000
Refactor `Cache::offset`
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df6932a
Move `Source` below `Cache`
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3b0f8a8
Factor out `Cache::read_tz_info`
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604501f
Add `Cache::read_from_tz_env_or_localtime`
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015b6af
Move `fallback_timezone` to `Cache::read_with_tz_name`
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01db875
Factor out `Cache::read_tzif`
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b54ef1a
Add `Cache::tzdb_dir` using dirs from `TimeZone::find_tz_file`
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f6a57d0
Split `Cache::read_from_tz_env_or_localtime`
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9638769
Move parsing of `TZ` variable to `unix` module
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c55c84d
Rename `Cache` to `CachedTzInfo`
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6937409
Check `TZDIR` environment variable
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f99aa51
Add proper cache refreshing
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b485ac2