New experimental `parallax pr-review <pr-number>` command

[maxigimenez]

This command is the first one that introduces on-demand triggers, the goal is simple, work on the requested changes on a PR.

The flow:

• We have a PR with comments to work on
• Trigger parallax pr-review <task-id> <pr-number>, note the as from here we can get the project information & repo information
• Grab all the open comments on the PR, with their respectives files and file line, and together with a good prompt, should execute to work on those, the result should be pushing the changes to the PR and closing the comments if possible.

Keep in mind a few things:

1. Add a big yellow experimental message when using this command
2. This should support comments coming from the same owner of the PR, as a owner cannot submit PR changes, just comments
3. Ignore comments from automated tools like Vercel deployments or others.

[maxigimenez]

Done by #12