feat(curriculum): restore seed + solution to Chinese (#40683)

* feat(tools): add seed/solution restore script

* chore(curriculum): remove empty sections' markers

* chore(curriculum): add seed + solution to Chinese

* chore: remove old formatter

* fix: update getChallenges

parse translated challenges separately, without reference to the source

* chore(curriculum): add dashedName to English

* chore(curriculum): add dashedName to Chinese

* refactor: remove unused challenge property 'name'

* fix: relax dashedName requirement

* fix: stray tag

Remove stray `pre` tag from challenge file.

Signed-off-by: nhcarrigan <nhcarrigan@gmail.com>

Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>

curriculum/challenges/chinese/10-coding-interview-prep/data-structures/create-a-set-class.md

@@ -3,6 +3,7 @@ id: 8d1323c8c441eddfaeb5bdef
 title: 创建一个Set类
 challengeType: 1
 videoUrl: ''
+dashedName: create-a-set-class
 ---
 
 # --description--
@@ -79,5 +80,73 @@ assert(
 );
 ```
 
+# --seed--
+
+## --seed-contents--
+
+```js
+class Set {
+  constructor() {
+    // Dictionary will hold the items of our set
+    this.dictionary = {};
+    this.length = 0;
+  }
+
+  // This method will check for the presence of an element and return true or false
+  has(element) {
+    return this.dictionary[element] !== undefined;
+  }
+
+  // This method will return all the values in the set
+  values() {
+    return Object.values(this.dictionary);
+  }
+
+  // Only change code below this line
+  
+  // Only change code above this line
+}
+```
+
 # --solutions--
 
+```js
+class Set {
+  constructor() {
+    this.dictionary = {};
+    this.length = 0;
+  }
+
+  has(element) {
+    return this.dictionary[element] !== undefined;
+  }
+
+  values() {
+    return Object.values(this.dictionary);
+  }
+
+  add(element) {
+    if (!this.has(element)) {
+      this.dictionary[element] = element;
+      this.length++;
+      return true;
+    }
+
+    return false;
+  }
+
+  remove(element) {
+    if (this.has(element)) {
+      delete this.dictionary[element];
+      this.length--;
+      return true;
+    }
+
+    return false;
+  }
+
+  size() {
+    return this.length;
+  }
+}
+```