Add ZonedDateTime data type to GQLAlchemy

[matea16]

Description

Added Zoned date time data type that Memgraph supports to GQLAlchemy.

Pull request type

• Feature

Related issues

Closes #300

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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Reviewer checklist (the reviewer checks this part)

• Core feature implementation
• Tests
• Code documentation
• Documentation on gqlalchemy/docs

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[as51340]

Nice job however I think we can improve this

[katarinasupe]

@matea16 merge the latest main for tests to pass.

[antepusic]

Good work! I agree with Andi’s comments about avoiding unnecessary nesting

[as51340]

Small comment but looks much better now