Addition of Automatic Review Configuration for GitHub App

[tjwp]

PR Type:

Enhancement

---

PR Description:

This pull request introduces an automatic review feature for the GitHub app. The auto_review command is added for an "opened" or "created" action for a pull request. This command triggers the PRReviewer to automatically review the pull request. The automatic review feature can be enabled or disabled through the settings. Additional logging has been added to provide more context when processing requests.

---

PR Main Files Walkthrough:

pr_agent/agent/pr_agent.py: Added the "auto_review" command to the command2class dictionary. This command triggers the PRReviewer. Also, added more logging to provide additional context when processing requests.
pr_agent/servers/github_app.py: Changed the command from "/review" to "/auto_review" in the handle_request function. This change triggers the automatic review when a pull request is opened or created.
pr_agent/tools/pr_reviewer.py: Added a new parameter "is_auto" to the PRReviewer class to indicate whether the review is automatic. If the automatic review is enabled in the settings and the review is automatic, the PRReviewer will review the pull request.
pr_agent/settings/configuration.toml: Added a new setting "automatic_review" to enable or disable the automatic review feature.

[idavidov]

/describe

[tjwp]

@idavidov I saw you had a previous comment. I set the automatic_review=true default to preserve the existing behavior of pr-agent. I don't have a strong opinion on whether the default is true or false.

For my organization, I override the default to false and then if a repo wants to opt into automatic review they can create a .pr_agent.toml file in the repo that sets automatic_review=true.