server : (webui) migrate project to ReactJS with typescript (#11688)

* init version

* fix auto scroll

* bring back copy btn

* bring back thought process

* add lint and format check on CI

* remove lang from html tag

* allow multiple generations at the same time

* lint and format combined

* fix unused var

* improve MarkdownDisplay

* fix more latex

* fix code block cannot be selected while generating

examples/server/webui/public/demo-conversation.json

@@ -11,7 +11,7 @@
     {
       "id": 1734087548327,
       "role": "assistant",
-      "content": "This is the formula:\n\n$\\frac{e^{x_i}}{\\sum_{j=1}^{n}e^{x_j}}$\n\nGiven an input vector \\(\\mathbf{x} = [x_1, x_2, \\ldots, x_n]\\)\n\n\\[\ny_i = \\frac{e^{x_i}}{\\sum_{j=1}^n e^{x_j}}\n\\]\n\nCode block latex:\n```latex\n\\frac{e^{x_i}}{\\sum_{j=1}^{n}e^{x_j}}\n```\n\nTest dollar sign: $1234 $4567\n\nInvalid latex syntax: $E = mc^$ and $$E = mc^$$",
+      "content": "This is the formula:\n\n$\\frac{e^{x_i}}{\\sum_{j=1}^{n}e^{x_j}}$\n\nGiven an input vector \\(\\mathbf{x} = [x_1, x_2, \\ldots, x_n]\\)\n\n\\[\ny_i = \\frac{e^{x_i}}{\\sum_{j=1}^n e^{x_j}}\n\\]\n\n$2x + y = z$\n\nCode block latex:\n```latex\n\\frac{e^{x_i}}{\\sum_{j=1}^{n}e^{x_j}}\n```\n\nTest dollar sign: $1234 $4567\n\nInvalid latex syntax: $E = mc^$ and $$E = mc^$$",
       "timings": {
         "prompt_n": 1,
         "prompt_ms": 28.923,