Add Jiff date/time types Zoned/TimeZone

[sgoll]

Description

This is a follow-up to #1271 and adds integration for the following Jiff date/time types:

• Zoned to GraphQL scalar ZonedDateTime¹
• tz::TimeZone to GraphQL scalar TimeZoneOrUtcOffset², and to GraphQL scalar TimeZone with a newtype
• tz::Offset to GraphQL scalar UtcOffset

The new types are hidden behind feature flag jiff-tz because they require enabling the std feature flag for the jiff crate (which is not necessary for the remaining Jiff date/time types introduced in #1271).

In addition, the jiff crate itself must be installed either with the default feature flags or with explicit feature flags that make the Time Zone Database available as explained in jiff time zone features.

Closes #1270

Footnotes

1. This GraphQL scalar is not documented at https://graphql-scalars.dev but we can introduce it here as laid out in https://github.com/graphql-rust/juniper/issues/1270#issuecomment-2291041828. ↩

2. This GraphQL scalar does not exist yet either. It is the union of GraphQL scalars TimeZone and UtcOffset. ↩

[tyranron]

@sgoll

The new types are hidden behind feature flag jiff-tz because they require enabling the std feature flag for the jiff crate (which is not necessary for the remaining Jiff date/time types introduced in #1271).

I think this is redundant. juniper at the moment is not capable of acting in no_std, so you could just add that feature and don't bother.

[sgoll]

I think this is redundant. juniper at the moment is not capable of acting in no_std, so you could just add that feature and don't bother.

I removed the feature flag and merged the master branch into this PR. With the recent commit that removed the panic in TimeZone, and the additions to your integration test, this is now ready for review and/or merge, I think.

[LegNeato]

Some minor nits. I'll give @tyranron a chance to look over but LGTM overall! Thanks for putting up such high quality PRs.

[LegNeato]

Is looks unrelated and there is already Decimal below

[sgoll]

Thank you for pointing this out. Originally, I noticed that the Rust type rust_decimal::Decimal in the table with the supported scalars had no link and added it.

But after your comment I now notice that the existing link seems to be unused. I have removed it (or changed its label to the one used in the table, if you want to think about it this way).

5ec7e8c, 2bd000c

[sgoll]

I am not sure whether the two failing tests in the last CI run are related to my changes.

[LegNeato]

Failures Re unrelated. Thanks again!