feat: add getCommitByHash API

seecoder-gitlab-client/src/main/java/com.nju.edu.gitlab/SeecoderGitlabClient.java

@@ -682,7 +682,7 @@ public class SeecoderGitlabClient implements SeecoderGitlabApi {
             Request.Builder builder = new Request.Builder()
                     .addHeader("Authorization", token);
             builder = builder
-                    .url(host + "/api/project/" + projectId + "/branch-commit/" + hash)
+                    .url(host + "/api/project/" + projectId + "/commitInfo/" + hash)
                     .get();
             Request request = builder.build();
             final Call call = client.newCall(request);