Extend `UnknownFlags` to `UnknownFlagsHandling` and introduce `PassUnknownFlagToArgs` (#337)#440

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ikedam wants to merge 3 commits intospf13:masterfrom

ikedam:feature/337_PreserveUnknownFlagsEnum

Commits on Mar 6, 2026

Extend `UnknownFlags` to `UnknownFlagsHandling` and introduce `UnknownFlagsHandlingPassUnknownToArgs` (#337)
ikedam
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Handle both ParseErrorsAllowlist and ParseErrorsWhitelist #337
ikedam
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Rename symbols to shorter ones #337
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