venus Task: Added per_page parameter to issues method

[aakanksharajput14]

I have implemented the following changes to enhance the issues retrieval functionality:

Updated issues method: Added a new per_page parameter to the issues function to allow users to specify the number of results returned per page.

Modified repo_issue_params helper: Updated the helper function to accept the per_page argument and include it in the API request parameters.

Logic Integration: Added a conditional check within repo_issue_params to ensure per_page is only added to the params dictionary if it is explicitly provided.

These changes ensure better control over pagination when fetching repository issues via the GitHub API.

[sigmavirus24]

There are no tests to validate this and even GitHub Copilot seems to hallucinate features of the API. I'm not surprised if I missed that these endpoints support specifying the number of items per page, but we default to the max anyway when iterating