feat: Added bookmark import/export function

plugins/builtin/include/content/views/view_bookmarks.hpp

@@ -14,6 +14,11 @@ namespace hex::plugin::builtin {
 
         void drawContent() override;
 
+    private:
+        static bool importBookmarks(prv::Provider *provider, const nlohmann::json &json);
+        static bool exportBookmarks(prv::Provider *provider, nlohmann::json &json);
+
+        void registerMenuItems();
     private:
         std::string m_currFilter;
     };