Support time of day inference

[baronfel]

We should be able to support parsing a time-of-day somehow, so that eg. a csv with a column of 14:55:10 can be inferred as a TimeSpan or something. We should also support naming this type in the schema suggestions, eg Schema = "Timestamp(TimeSpan)"

[ovatsus]

See #1027

[github-actions]

🤖 This is an automated response from Repo Assist.

Good news — this is addressed by PR #1609, which I submitted as a draft for maintainer review.

What PR #1609 adds:

• DateOnly automatic inference — date-only strings like "2022-06-11" are inferred as DateOnly on .NET 6+ targets. DateOnly is a subtype of DateTime in the type hierarchy, so mixed date/datetime columns still unify to DateTime (no breaking change).
• TimeOnly via explicit annotation — TimeOnly is available by annotating a CSV column header as timeonly? or timeonly option, or via an explicit JSON/XML schema hint. Time-of-day strings like "14:55:10" are not auto-inferred because they are ambiguous with TimeSpan (e.g. "00:30:00" is a valid TimeSpan too), so automatic inference would be a silent breaking change for existing code.

This effectively covers the use case from this issue. If you have a moment, feedback on the PR would be welcome!

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