Allow generating any random DateTime<Tz> where Tz: Timezone + Dummy

[kyrias]

This means that any additional timezones will be supported automatically just as long as Dummy<Faker> is implemented for them.

This also updates the chrono-tz dependency to the newest major version.

[kyrias]

One thing I realized is that it would be good if there was some way to give the fake crate some form of constraints, f.ex. limiting which years it'll try to generate datetimes for. Not sure how one would go about implementing that into the current API though. Maybe having some kind of AnyMap in the Faker struct that relevant constraints could be retrieved from by the Dummy implementation?

[cksac]

you can use different config struct e.g. DateOnYear(String) and implement Dummy.

[cksac]

what is use of this impl?

[kyrias]

Without this implementation there would be no implementation of Dummy<Faker> for DateTime<Utc>.

[kyrias]

you can use different config struct e.g. DateOnYear(String) and implement Dummy.

Oh I didn't realize that you could specify an override type with #[dummy(faker = ...)]. It would be useful if the docs.rs docs were built with the features enabled. :)

The downside with that approach is that it seems like you'd have to reimplement the entire Dummy implementation for every possible kind of constraint rather than being able to have a single implementation for the type, but this is workable I guess.