feat(custom-routes): expose query params on request object

[singhvishalkr]

Summary

Exposes query parameters to custom route handlers via req.query, similar to how Express.js handles them. When a request like /greetings?name=you comes in, the handler can access req.query.name directly.

Changes

• Added QueryDictionary type to ParamsIncomingMessage.ts
• Added query property to ParamsIncomingMessage interface
• Updated HTTPReceiver to parse query params and attach to request
• Updated SocketModeReceiver to do the same
• Exported QueryDictionary and ParamsIncomingMessage from index.ts

Example

customRoutes: [
  {
    path: '/greetings',
    method: ['GET'],
    handler: (req, res) => {
      res.writeHead(200);
      res.end(+""+Hello +""+${req.query?.name || 'World'}!);
    },
  },
]

Requesting /greetings?name=you returns "Hello you!"

For repeated keys like /test?tags=a&tags=b, req.query.tags becomes ['a', 'b'].

Fixes #2100

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Latest commit: 82a8f65

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