chore: optimized stats calculation by fetching contribution data in p…

…arallel using `Promise.all` (#416)

- Replaced sequential for loop with Promise.all to fetch contributions for each year in parallel.
- Utilized Array.reduce to aggregate total commit contributions, restricted contributions, and pull request review contributions.
- Improved performance by reducing the overall time to retrieve data from GitHub API.

src/fetcher/stats.ts

@@ -252,17 +252,26 @@ async function stats(username: string): Promise<User> {
   const startYear = await getUserJoinYear(username);
   const endYear = new Date().getFullYear();
 
-  let TotalCommitContributions = 0;
-  let RestrictedContributionsCount = 0;
-  let TotalPullRequestReviewContributions = 0;
-
+  const contributionPromises = [];
   for (let year = startYear; year <= endYear; year++) {
-    const contributions = await fetchContributions(username, year);
-    TotalCommitContributions += contributions.totalCommitContributions;
-    RestrictedContributionsCount += contributions.restrictedContributionsCount;
-    TotalPullRequestReviewContributions += contributions.totalPullRequestReviewContributions;
+    contributionPromises.push(fetchContributions(username, year));
   }
 
+  const contributions = await Promise.all(contributionPromises);
+
+  const TotalCommitContributions = contributions.reduce(
+    (total, contribution) => total + contribution.totalCommitContributions,
+    0
+  );
+  const RestrictedContributionsCount = contributions.reduce(
+    (total, contribution) => total + contribution.restrictedContributionsCount,
+    0
+  );
+  const TotalPullRequestReviewContributions = contributions.reduce(
+    (total, contribution) => total + contribution.totalPullRequestReviewContributions,
+    0
+  );
+
   const data = await axios({
     method: "post",
     url: "https://api.github.com/graphql",