feat(plugins/leetcode): add plugin (#1213) [skip ci]

source/plugins/leetcode/queries/recent.graphql

@@ -0,0 +1,8 @@
+query Recent ($username: String!, $limit: Int!) {
+  recentAcSubmissionList(username: $username, limit: $limit) {
+    id
+    title
+    titleSlug
+    timestamp
+  }
+}