feat(discussions): refactor get_discussions function for pagination support

[Jalmeida1994]

Pull Request

This pull request includes enhancements to the get_discussions function in discussions.py to support pagination and improvements to the corresponding tests in test_discussions.py. The most important changes include adding pagination to the GraphQL query, handling pagination in the function, and updating the tests to cover these scenarios.

Closes #44

Proposed Changes

• Add pagination support to GitHub Discussions Query.

Respective Issue: #44

Readiness Checklist

Author/Contributor

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Reviewer

• Label as either fix, documentation, enhancement, infrastructure, maintenance, or breaking

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