feat: add overview (#391)

### What problem does this PR solve?

feat: render stats charts
feat: create api token
feat: delete api token
feat: add ChatApiKeyModal
feat: add RagLineChart


Issue link: #345

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/chat/chat-overview-modal/index.less

@@ -0,0 +1,21 @@
+.chartWrapper {
+  height: 40vh;
+  overflow: auto;
+}
+
+.chartItem {
+  height: 300px;
+  padding: 10px 0 30px;
+}
+
+.chartLabel {
+  display: inline-block;
+  padding-left: 60px;
+  padding-bottom: 20px;
+}
+.linkText {
+  border-radius: 6px;
+  padding: 6px 10px;
+  background-color: #eff8ff;
+  border: 1px;
+}