Degree centrality algorithm

[jmatak]

Description

Implementation of degree centrality algorithm. More information about algorithm: https://www.sci.unich.it/~francesc/teaching/network/degree.html

Pull request type

• [x] 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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