Request more metadata for changelog entries to the PR template (#575)

* Include more metadata for changelog updates to PR template

* Update pull_request_template.md

* Pre-commit fixes

Author: PGijsbers

.github/pull_request_template.md

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+<!--
+Please carefully follow the instructions of the template, as they allow for more effective reviews with fewer back-and-forth, making a smoother process for everyone.
+Prefer small, independent PRs over big monolithic ones when possible.
+If you are only looking for feedback, clearly indicate this and open it as a "draft" instead (use the green "v" button next to "create pull request").
+-->
+
+
+## Change(s)
+<!-- Briefly describe the change of this PR, if there are multiple changes, please describe them separately. -->
+Change Type: <!-- Added/Changed/Deprecated/Removed/Fixed/Security -->
+
+Change Category: <!-- Documentation/Interface/Internal/Other -->
+
+Changelog Entry: <!-- Brief description of the change, possibly followed by more details in a separate paragraph. For example: -->
+
+<!--
+Added the `contacts` field to the `AIResource` `GET` endpoints with full contact information.
+
+This field contains the full contact information of the contacts whose identifiers are currently already provided through the `contact` field.
+-->
+
+
+
+## How to Test
+<!-- Describe a way to test the change of this PR if it requires special steps beyond CI/CD. You're writing this for the reviewer. -->
+
+## Checklist
+- [ ] Tests have been added or updated to reflect the changes, or their absence is explicitly explained. <!-- For code changes -->
+- [ ] Documentation has been added or updated to reflect the changes, or their absence is explicitly explained.
+- [ ] A self-review has been conducted checking:
+  - No unintended changes have been committed.
+  - The changes in isolation seem reasonable.
+  - Anything that may be odd or unintuitive is provided with a GitHub comment explaining it (but consider if this should not be a code comment or in the documentation instead).
+- [ ] All CI checks pass before pinging a reviewer, or provide an explanation if they do not.
+- [ ] The PR title matches the changelog entry's one-line description.
+
+## Related Issues
+<!-- Provide a list of relevant issues and/or pull requests, if any. -->
+<!-- If the pull request closes and issue, specify "Closes #X" (where X is the issue number). -->