Αctivity list view (via URL parameter) for pull requests and issues

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Commonly, in Issues and especially PRs it's difficult to track the order the activity took place.
Especially in PRs, there can be high, complicated activity, e.g. multiple review boxes, replies to any of these boxes in any order, both resolved and unresolved comments, various commits in between, etc.

My suggestion is to provide an alternative view for pull requests and issues, to display them as a timestamp activity list.

e.g. for a PR such as https://github.com/example/example-repo/pull/1 to be able to display it as an activity list (with links to each item),
via a activitylist=1 URL parameter: https://github.com/example/example-repo/pull/1?activitylist=1:

1. [00:00] author submitted PR
2. [00:05] user_x posted comment_1
3. [00:10] user_y started review_1
4. [00:15] author replied to review_1
5. [00:20] author commited commit_1
6. [00:25] author marked review_1 as resolved
7.  (etc)
8. [02:00] collaborator_z merged commit_5 into repo:main