Scratch tool: generate a fragment extension with every color scheme (#16962)

#16953 got me thinking: what if we just published an extension ourselves
that just packages up every color scheme in the ever-amazing
https://github.com/mbadolato/iTerm2-Color-Schemes?

Well, this isn't a package for that file. 

But it is a script to generate a fragment with all of them, and blat it
into your `%LOCALAPPDATA%\Microsoft\Windows Terminal\Fragments`.

It's a notebook because I've been really fascinated with the Polyglot
Notebooks recently.

src/tools/schemes-fragment/import-all-schemes.ipynb

@@ -0,0 +1,147 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# ITerm2 schemes for the Terminal\n",
+    "\n",
+    "This is a little helper script to gather up all the color schemes in [mbadolato/iTerm2-Color-Schemes](https://github.com/mbadolato/iTerm2-Color-Schemes), and put them in a single fragment extension for the Terminal. \n",
+    "\n",
+    "\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "dotnet_interactive": {
+     "language": "pwsh"
+    },
+    "polyglot_notebook": {
+     "kernelName": "pwsh"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "# Clone the repo into the temp directory\n",
+    "\n",
+    "cd \"$env:TEMP\"\n",
+    "if (Test-Path -Path \"$env:TEMP\\iTerm2-Color-Schemes\") {\n",
+    "    Remove-Item -Recurse -Force \"$env:TEMP\\iTerm2-Color-Schemes\"\n",
+    "}\n",
+    "git clone --depth 1 https://github.com/mbadolato/iTerm2-Color-Schemes.git\n",
+    "\n",
+    "cd \"$env:TEMP\\iTerm2-Color-Schemes\""
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "dotnet_interactive": {
+     "language": "pwsh"
+    },
+    "polyglot_notebook": {
+     "kernelName": "pwsh"
+    }
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Importing schemes from 'C:\\Users\\migrie\\AppData\\Local\\Temp\\iTerm2-Color-Schemes'\n",
+      "Found 319 schemes\n",
+      "\u001b[K  Importing C:\\Users\\migrie\\AppData\\Local\\Temp\\iTerm2-Color-Schemes\\windowsterminal\\zenwritten_light.json                         Imported json for 319 schemes\n",
+      "\n",
+      "    Directory: C:\\Users\\migrie\\AppData\\Local\\Microsoft\\Windows Terminal\\Fragments\n",
+      "\n",
+      "\u001b[32;1mMode   \u001b[0m\u001b[32;1m              LastWriteTime\u001b[0m \u001b[32;1;3m        Length\u001b[0m\u001b[32;1m Name\u001b[0m\n",
+      "\u001b[32;1m----   \u001b[0m \u001b[32;1m             -------------\u001b[0m \u001b[32;1m        ------\u001b[0m \u001b[32;1m----\u001b[0m\n",
+      "d----           3/28/2024  6:30 AM                \u001b[44;1mAllColorSchemes\u001b[0m\n",
+      "Fragment json written to C:\\Users\\migrie\\AppData\\Local\\Microsoft\\Windows Terminal\\Fragments\\AllColorSchemes\\schemes.json\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "cd \"$env:TEMP\\iTerm2-Color-Schemes\"\n",
+    "\n",
+    "Write-Host \"Importing schemes from '$env:TEMP\\iTerm2-Color-Schemes'\"\n",
+    "\n",
+    "# Iterate over all the files in the `windowsterminal` directory\n",
+    "\n",
+    "$allSchemesFiles = Get-ChildItem -Path \"$env:TEMP\\iTerm2-Color-Schemes\\windowsterminal\" -Filter *.json\n",
+    "Write-host \"Found $($allSchemesFiles.Count) schemes\"\n",
+    "\n",
+    "$allSchemeJsons = @()\n",
+    "\n",
+    "$allSchemesFiles | ForEach-Object {\n",
+    "\n",
+    "    Write-Host \"`r`e[K  Importing $_           \" -NoNewline\n",
+    "    $json = Get-Content $_.FullName -Raw | ConvertFrom-Json\n",
+    "    $allSchemeJsons += $json\n",
+    "\n",
+    "}\n",
+    "Write-Host \"\"\n",
+    "Write-Host \"Imported json for $($allSchemeJsons.Count) schemes\"\n",
+    "\n",
+    "# Create a new fragment json in the temp directory with all the schemes added to a \"schemes\" array\n",
+    "\n",
+    "$fragmentJson = @{\n",
+    "    \"schemes\" = $allSchemeJsons\n",
+    "} | ConvertTo-Json\n",
+    "\n",
+    "# Remove the existing fragment json if it exists\n",
+    "$fragmentDir = $env:LOCALAPPDATA + \"\\Microsoft\\Windows Terminal\\Fragments\\AllColorSchemes\"\n",
+    "$fragmentPath = $fragmentDir + \"\\schemes.json\"\n",
+    "if (Test-Path -Path $fragmentPath) {\n",
+    "    Remove-Item -Path $fragmentPath\n",
+    "}\n",
+    "# make sure the directory exists\n",
+    "New-Item -Path $fragmentDir -ItemType Directory -Force\n",
+    "\n",
+    "# Write the fragment json to the fragments directory\n",
+    "Write-Output $fragmentJson | Out-File $fragmentPath -Encoding Utf8\n",
+    "\n",
+    "write-host \"Fragment json written to $fragmentPath\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "After running this notebook, all the color schemes will be available in the Terminal. You'll probably need to go touch the settings to get them reloaded. "
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": ".NET (C#)",
+   "language": "C#",
+   "name": ".net-csharp"
+  },
+  "language_info": {
+   "name": "polyglot-notebook"
+  },
+  "polyglot_notebook": {
+   "kernelInfo": {
+    "defaultKernelName": "csharp",
+    "items": [
+     {
+      "aliases": [],
+      "name": "csharp"
+     },
+     {
+      "aliases": [],
+      "languageName": "pwsh",
+      "name": "pwsh"
+     }
+    ]
+   }
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}