Add custom auth

[antepusic]

Description

This PR adds custom auth capabilities so that users can connect to GQLAlchemy with SSO tokens.

Pull request type

Please delete options that are not relevant.

• Feature

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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[katarinasupe]

@antepusic is there any test or example of how to use this feature in GQLAlchemy?
If you can, please add an example to https://memgraph.github.io/gqlalchemy/how-to-guides/overview/ as a separate guide -"Connect with SSO" or similar. I am mostly interested in how MG_SCHEME should look like.

FYI, as discussed, this will be included in the next release (July 10th). Work on Memgraph is a priority, so if you can't make it, we can move the milestone due date.

[antepusic]

Thanks for the heads-up @katarinasupe! In the process of working on the docs, I’ll create a usage example and adapt it to GQLAlchemy tests & docs. This should happen sometime this week, does that work for you?

[katarinasupe]

Hi @antepusic what is the status with this? Release should happen tomorrow, and we should have enough time to review.