feat: add functionality to copy selected raw JSON in JsonViewer and update related state management

src/init/i18n/locales/BritishEnglish.json

@@ -73,6 +73,7 @@
     "visualisedResult": "Visualised Result",
     "matches": "matches",
     "copied": "Copied!",
+    "copyRawJson": "Copy selected JSON",
     "copyAsCsv": "Copy as CSV",
     "error": "Error:"
   },

src/init/i18n/locales/SimplifiedChinese.json

@@ -73,6 +73,7 @@
     "visualisedResult": "可视化结果",
     "matches": "个匹配",
     "copied": "已复制！",
+    "copyRawJson": "复制选中 JSON",
     "copyAsCsv": "复制为 CSV",
     "error": "错误："
   },