Add transactions queries

[katarinasupe]

Description

I added get transactions and terminate transactions methods for easier transaction management.

Pull request type

• Feature

Related issues

Closes #240

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 TODO generate reference guide
• 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

######################################

Reviewer checklist (the reviewer checks this part)

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

######################################

[antepusic]

I think this is all right once you apply the below suggestion:

[antepusic]

@katarinasupe Is this also milestone 1.6.0 like #309?

[katarinasupe]

@katarinasupe Is this also milestone 1.6.0 like #309?

Yes! Thank you, I updated it. I just need to deal with the tests first since I bumped up Memgraph in the workflow :D Then I'll incorporate your suggestions.

[as51340]

Nice work, few comments

[as51340]

Just one small comment, otherwise good, I will approve. Delete unnecessary variable initialization

[antepusic]

Seconding Andi’s comment