Add Issue Linking Section to PR Template

[samadpls]

Is your feature or enhancement request related to a problem or limitation? Please describe
The current PR template doesn't prompt contributors to use Fixes #issue-number or similar keywords which are necessary for automatically closing issues when a PR is merged. This often leads to issues not being linked or closed automatically, requiring manual intervention.

Describe your enhancement idea

Add a section to the PR template:

### Does this close any currently open issues?
Fixes # (issue)