feat: Implement the legend selector in metrics charts (#447)

src/locales/lang/en.ts

@@ -154,6 +154,7 @@ const msg = {
   legendOptions: "Legend Options",
   showLegend: "Show Legend",
   asTable: "As Table",
+  asSelector: "As Selector",
   toTheRight: "To The Right",
   legendValues: "Legend Values",
   minDuration: "Minimal Request Duration",

src/locales/lang/es.ts

@@ -397,5 +397,6 @@ const msg = {
   instances: "Instances",
   snapshot: "Snapshot",
   expression: "Expression",
+  asSelector: "As Selector",
 };
 export default msg;

src/locales/lang/zh.ts

@@ -152,6 +152,7 @@ const msg = {
   legendOptions: "图例选项",
   showLegend: "显示图例",
   asTable: "作为表格",
+  asSelector: "作为选择器",
   toTheRight: "在右边",
   legendValues: "图例值",
   minDuration: "最小请求持续时间",