Add resolve and reply support

cache.go

@@ -118,6 +118,26 @@ func (c *CachedGitHubService) LivePullRequest(
 	return details, nil
 }
 
+func (c *CachedGitHubService) SetThreadResolved(
+	ctx context.Context, threadID string, resolved bool,
+) (ReviewThread, error) {
+	writer, ok := c.remote.(GitHubWriteService)
+	if !ok {
+		return ReviewThread{}, errors.New("GitHub service does not support write actions")
+	}
+	return writer.SetThreadResolved(ctx, threadID, resolved)
+}
+
+func (c *CachedGitHubService) ReplyToThread(
+	ctx context.Context, threadID, body string,
+) (ReviewComment, error) {
+	writer, ok := c.remote.(GitHubWriteService)
+	if !ok {
+		return ReviewComment{}, errors.New("GitHub service does not support write actions")
+	}
+	return writer.ReplyToThread(ctx, threadID, body)
+}
+
 func (c *CachedGitHubService) pullRequestsKey(owner, repo string, limit int, showAll bool) string {
 	return fmt.Sprintf("prs:%s/%s:%d:%t", owner, repo, limit, showAll)
 }