Add more links to project URLs in pyproject.toml

[benberryallwood]

Summary

Adds "Changelog", "Issues" and "Repository" links to the project.urls section of the pyproject.toml file.

Why

These links appear on the PyPI project page. They're also useful for tools like Renovate which read this metadata.

See the PyPA docs for details on this section and commonly provided links.

How is this tested?

N/A

[github-actions]

If integration tests don't run automatically, an authorized user can run them manually by following the instructions below:

Trigger:
go/deco-tests-run/sdk-py

Inputs:

• PR number: 1348
• Commit SHA: 37fae98629c46c72d70ec6349fae56cc36a8c892

Checks will be approved automatically on success.

[github-actions]

Please ensure that the NEXT_CHANGELOG.md file is updated with any relevant changes.
If this is not necessary for your PR, please include the following in your PR description:
NO_CHANGELOG=true
and rerun the job.