Adds parameter for DateTimeKind

[njlr]

• Adds the generator Gen.dateTimeKind for DateTimeKind values
• Adds a parameter to Gen.dateTime for providing a DateTimeKind generator
• Adds the generator Gen.dateTimeUtc for DateTime values with kind Utc
• Adds the generator Gen.dateTimeLocal for DateTime values with kind Local
• Adds the generator Gen.dateTimeUnspecified for DateTime values with kind Unspecified
• Removes a poorly defined test

This is a (minor) breaking change to Gen.dateTime.

Closes #426

[moodmosaic]

That's a good change! The old Gen.dateTime silently produced DateTimeKind.Unspecified, which could mask bugs where Kind matters.

[moodmosaic]

@njlr, happy to merge this (if you're not planning to add additional commits).

[njlr]

@njlr, happy to merge this (if you're not planning to add additional commits).

Ready from my end 🙂

[moodmosaic]

Thank you, @njlr!