[E-path < T489-T491] Add path combine, slice and elements

[imilinovic]

Description

Add path combine, slice and elements.

Pull request type

• [ ] Bugfix
• [X] 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

• [x] Core algorithm/module implementation
• [x] Query module implementation
• [x] Unit tests
• [x] 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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[imilinovic]

The std::move currently copies but it will be implemented to actually move later on

[imilinovic]

This needs the new path testing PR on MAGE

[antoniofilipovic]

@imilinovic which Memgraph this PR needs?

[antoniofilipovic]

Also ping @vpavicic to be in loop for path functions

[antoniofilipovic]

@imilinovic can you also update README on MAGE here?