Automatic Assignment of Pull Request Author as Issue Assignee When set-assignee: true

[tktcorporation]

Implement a feature to automatically assign the pull request author as the assignee for an associated issue when set-assignee: true is specified in the configuration. This will streamline the workflow by ensuring that the PR author is directly connected to the issue they're working on without requiring manual assignment.

This feature will help keep track of responsibilities, especially in collaborative environments where multiple contributors are involved.

Acceptance Criteria:

• When set-assignee: true is specified, the pull request author should automatically be set as the assignee for the related issue.
• The feature should be optional and controlled by the set-assignee configuration parameter.