feat(MessageEmbed): add setFields method (#6186)

Co-authored-by: SpaceEEC <spaceeec@yahoo.com>

src/structures/MessageEmbed.js

@@ -298,6 +298,16 @@ class MessageEmbed {
     return this;
   }
 
+  /**
+   * Sets the embed's fields (max 25).
+   * @param {...EmbedFieldData|EmbedFieldData[]} fields The fields to set
+   * @returns {MessageEmbed}
+   */
+  setFields(...fields) {
+    this.spliceFields(0, this.fields.length, fields);
+    return this;
+  }
+
   /**
    * Sets the author of this embed.
    * @param {string} name The name of the author