Add WebSocketBot as external MCCScript bot with string enum serialization

Port the WebSocket bot functionality to an external standalone script that:
- Uses //MCCScript 1.0 format instead of being a built-in bot
- Uses System.Text.Json instead of Newtonsoft.Json (no external DLL)
- Serializes ItemType, EntityType, and other enums as string names
  instead of numeric IDs (addresses #2805)
- Adds GetItemTypeMappings and GetEntityTypeMappings commands
- Accepts both string names and numeric IDs for enum parameters
- Uses 4096 byte WebSocket buffer for better message handling

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

MinecraftClient/MinecraftClient.csproj

@@ -62,6 +62,7 @@
     <Compile Remove="config\ChatBots\SugarCaneMiner.cs" />
     <Compile Remove="config\ChatBots\TreeFarmer.cs" />
     <Compile Remove="config\ChatBots\VkMessager.cs" />
+    <Compile Remove="config\ChatBots\WebSocketBot.cs" />
     <Compile Remove="config\sample-script-extended.cs" />
     <Compile Remove="config\sample-script-packet-capture.cs" />
     <Compile Remove="config\sample-script-pm-forwarder.cs" />