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

source/plugins/leetcode/queries/languages.graphql

@@ -0,0 +1,8 @@
+query Languages ($username: String!) {
+  matchedUser(username: $username) {
+    languageProblemCount {
+      languageName
+      problemsSolved
+    }
+  }
+}

source/plugins/leetcode/queries/problems.graphql

@@ -0,0 +1,18 @@
+query Problems ($username: String!) {
+  allQuestionsCount {
+    difficulty
+    count
+  }
+  matchedUser(username: $username) {
+    problemsSolvedBeatsStats {
+      difficulty
+      percentage
+    }
+    submitStatsGlobal {
+      acSubmissionNum {
+        difficulty
+        count
+      }
+    }
+  }
+}

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
+  }
+}

source/plugins/leetcode/queries/skills.graphql

@@ -0,0 +1,18 @@
+query Skills ($username: String!) {
+  matchedUser(username: $username) {
+    tagProblemCounts {
+      advanced {
+        tagName
+        problemsSolved
+      }
+      intermediate {
+        tagName
+        problemsSolved
+      }
+      fundamental {
+        tagName
+        problemsSolved
+      }
+    }
+  }
+}