CI/CD: Duplicate Issue Detection and Automatic Marking

[Abhinandankaushik]

Description

Currently, duplicate issues and pull requests are often created in the repository, leading to redundant discussions, repeated work, and extra maintenance overhead for maintainers. There is no automated mechanism in the CI/CD pipeline to detect potential duplicates and flag them proactively.

I propose adding an automated duplicate issue detection mechanism in the CI/CD workflow that:

• Scans newly created issues and pull requests for similarity with existing ones.
• Identifies potential duplicates based on title, description, and labels.
• Automatically marks suspected duplicates with a label such as possible-duplicate.
• Adds a bot comment suggesting existing related issues with links.
• Optionally closes the issue if an exact match is found (configurable behavior).

[github-actions]

Welcome to AsyncAPI. Thanks a lot for reporting your first issue. Please check out our contributors guide and the instructions about a basic recommended setup useful for opening a pull request.
Keep in mind there are also other channels you can use to interact with AsyncAPI community. For more details check out this issue.

[AceTheCreator]

I don't think that's a necessary issue or complain for this project