Support room level security schemes

[zamd]

We define security schemes at the root level and same schemes are applied to all endpoints. This doesn't work in the Try box.

  "security": [
    {
      "authlete": []
    },
    {
      "bearer": []
    }
  ]

 "securitySchemes": {
     "authlete": {
       "type": "oauth2",
       "description": "Click the **Get Token** button below to log in with your Authlete account and retrieve an access token for API access.",
       "flows": {
         "authorizationCode": {
           "authorizationUrl": "https://login.authlete.com/authorize",
           "tokenUrl": "https://login.authlete.com/token",
           "scopes": {
             "authlete": "Inherit Authlete Account Permissions"
           },
           "x-client-id": "api-explorer",
           "x-default-scopes": "authlete",
           "x-pkce-only": true
         }
       }
     },
     "bearer": {
       "type": "http",
       "scheme": "bearer",
       "description": "Obtain an **access token** and set it in the following textbox."
     }
   }

[linear]

ZUP-3609 Support room level security schemes