[E-export < T338] Implement export_csv_graph

[mpintaric55334]

Description

Please briefly explain the changes you made here.

Pull request type

• Bugfix
• Algorithm/Module
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Related issues

Delete if this PR doesn't resolve any issues. Link the issue if it does.

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Reviewer checklist (the reviewer checks this part)

Module/Algorithm

• Core algorithm/module implementation
• Query module implementation
• Unit tests
• End-to-end tests
• Code documentation
• README short description
• Documentation on memgraph/docs
• Update GQLALchemy signatures in query builder using query module signature generator

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[antoniofilipovic]

Looks good, I suggested few changes what to do

[antepusic]

Looks good, left a few comments. Two of them relate to several files so I’m posting them here:

• Line breaks: csv.writer chooses the system-appropriate line break, but it’s safer to use split(data, "\n") in the tests (some systems use just "\n", and trim will remove the "\r" anyway)
• I think the tests would be easier to follow if you changed the last line of the test query to RETURN row[1] AS labels, row[7] AS type;

[antoniofilipovic]

Last few changes

[antoniofilipovic]

Looks good to me

[antepusic]

Approved 🚀
Before merging, just make sure to rename separateHeader and address this previous comment of mine.