Add CSV export query results module

[katarinasupe]

Description

I created csv_query procedure inside export_util module. Find arguments description in docstring.

Discussed with @Josipmrden:

• Potentially use pandas instead of csv - what are the pros? - Use csv, pandas would be new dependency, and csv is not.
• Leave config as a map or add stream as an argument. Another option is to return the stream and remove it from the arguments altogether. I vote for this. - The option to always return the stream is not good with big results, since it always has to write to stream, even if the user only wants to save in file. The config parameter does not make sense for MAGE modules, so we will go with stream as argument.
• Probably edit the path inside the code to be /usr/lib/memgraph/query_modules instead of /var/lib/memgraph/internal_modules used for development. In json() procedure in this module, I left it to the user to provide the whole path and advised them to provide /usr/lib/memgraph/query_modules/something.json. This may be a better way to go. - We will go with path and handle potential errors

TODOs:

• Use path as argument instead of file name
• Add error handling for opening file path
• Use stream as argument
• Update README
• Add tests
• Write docs - [master < add-export-csv-query-procedure] Add export_util.csv_query() procedure docs docs#761

Pull request type

• Algorithm/Module

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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

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[Josipmrden]

As for Pandas, I think it makes it more easier to work with CSV files, but we can check what are the implications of adding another dependency into MAGE.

As for the second one, I'm fine with both.

3. ok, makes sense

[antoniofilipovic]

@katarinasupe what is benchmarking difference between csv and pandas? When doing writes. Is there any difference

[katarinasupe]

I did not benchmark it @antoniofilipovic. csv can be used out of the box, while pandas must be added as a new dependency to MAGE.

[katarinasupe]

@Josipmrden, do you know what is happening with tests? Suddenly they decided to fail 😂