Function create_pull_request

Create a pull request via the Codemod API. `task_id` is the workflow task UUID (available as `task.id` in the engine). Returns the PR URL on success, if the API response includes one.

(
    title: &str,
    body: Option<&str>,
    draft: bool,
    head: &str,
    base: Option<&str>,
    task_id: &str,
    working_dir: &std::path::Path,
)