Add display_timezone support to dateTime element

[kszot-ref]

Motivation

A new feature was added on kontent-ai side - support for timezones (https://portal.productboard.com/kontent/2-kontent-ai-public-roadmap/c/176-configure-timezones-when-working-with-date-and-time-element). By default the "value" field contains the UTC time, but REST API now also stores a new field called "display_timezone", which should contain a timezone string.

Checklist

• Code follows coding conventions held in this repo
• Automated tests have been added (updated snapshots)
• Tests are passing
• Docs have been updated (if applicable)
• Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

[IvanKiral]

Hey, thanks for the PR :) There is a planned migration to the Gatsby 5. Would you like to have this PR already in v4 or is it enough to have it in v5?

[kszot-ref]

Hey, ideally I'd like it included in v4, but v5 would be fine as well.

[Simply007]

Hey, ideally I'd like it included in v4, but v5 would be fine as well.

Hello @kszot-ref,

I think we can include this feature into the v4 supported package and release it as a minor version as the last and then we move on with v5 supported and release a new major version of gatsby packages.

Would it be possible to rebase your PR to resolve the conflicts? I have merged the prior feature requests - asset renditions #215.

[kszot-ref]

Hi @Simply007,

I've updated my branch - squashed the changes into a single commit and rebased it against your master branch

[Simply007]

Thank you for the PR @kszot-ref!

I went through and everything is in place. I will approve this one and push the example in a separate PR.

[Simply007]

Was released in 9.2.0: https://github.com/kontent-ai/gatsby-packages/releases/tag/9.2.0