Update server-everything to allow choosing the transport on the command line.

# Run the default (stdio) server
```npx @modelcontextprotocol/server-everything```

# Or specify stdio explicitly
```npx @modelcontextprotocol/server-everything stdio```

# Run the SSE server
```npx @modelcontextprotocol/server-everything sse```

# Run the streamable HTTP server
```npx @modelcontextprotocol/server-everything streamableHttp```

* In src/everything/index.ts
  - refactor/extracted contents to stdio.ts
  - replaced with code that
    - Gets the single argument from the commandline as scriptName
    - switches on scriptName
    - imports the appropriate server script or outputs usage options
  - scripts run on import

* In src/everything/stdio.ts
  - added console log "Starting default (STDIO) server..."

* In src/everything/sse.ts
  - added console log "Starting SSE server..."

* In src/everything/streamableHttp.ts
  - added console log "Starting Streamable HTTP server..."

* This fixes #1594

src/everything/streamableHttp.ts

@@ -4,6 +4,8 @@ import express, { Request, Response } from "express";
 import { createServer } from "./everything.js";
 import { randomUUID } from 'node:crypto';
 
+console.log('Starting Streamable HTTP server...');
+
 const app = express();
 
 const { server, cleanup } = createServer();