feat: pull request backporting

feat: backport still open pull requests

src/service/git/github/github-mapper.ts

@@ -0,0 +1,33 @@
+import { GitPullRequest } from "@bp/service/git/git.types";
+import { PullRequest, User } from "@octokit/webhooks-types";
+
+export default class GitHubMapper {
+
+  mapPullRequest(pr: PullRequest): GitPullRequest {
+    return {
+      number: pr.number,
+      author: pr.user.login,
+      url: pr.url,
+      htmlUrl: pr.html_url,
+      title: pr.title,
+      body: pr.body ?? "",
+      state: pr.state,
+      merged: pr.merged ?? false,
+      mergedBy: pr.merged_by?.login,
+      reviewers: pr.requested_reviewers.filter(r => "login" in r).map((r => (r as User)?.login)),
+      sourceRepo: {
+        owner: pr.head.repo.full_name.split("/")[0],
+        project: pr.head.repo.full_name.split("/")[1],
+        cloneUrl: pr.head.repo.clone_url
+      },
+      targetRepo: {
+        owner: pr.base.repo.full_name.split("/")[0],
+        project: pr.base.repo.full_name.split("/")[1],
+        cloneUrl: pr.base.repo.clone_url
+      },
+      nCommits: pr.commits,
+      // if pr is open use latest commit sha otherwise use merge_commit_sha
+      commits: pr.state === "open" ? [pr.head.sha] : [pr.merge_commit_sha as string]
+    };
+  }
+}