feat: Pluggable datetime parsing

### Is your feature request related to a problem or challenge?

Add support for pluggable datetime parsing - Chrono by default, jiff as an option if feature enabled, with the possibility of others in the future (Java format comes to mine for comet).

Jiff is [faster overall for parsing](https://github.com/BurntSushi/jiff/blob/master/COMPARE.md#jiff-is-generally-faster-than-chrono) though it's not quite as lenient as chrono though with some of the [strptime options](https://docs.rs/jiff/latest/jiff/fmt/strtime/index.html#conversion-specifications).

In testing Jiff is about twice as fast as Chrono as long the format matches the string - Jiff errors are more expensive than Chrono errors.

This would impact to_timestamp, to_date and to_time.

### Describe the solution you'd like

Extract out a DateTimeParser trait with Chrono and Jiff implementations with jiff behind a feature flag.

### Describe alternatives you've considered

Leave things unchanged.

### Additional context

_No response_