Register configuration programmatically
Is there any way to set the configuration programmatically similar to the way providers are registered with `registerProvider(...)`? For example, something similar to 

```js
registerConfiguration({
  rootDir: __dirname,
  acceptMimes: ['application/json'],
  httpPort: AppConfig.PORT,
  httpsPort: false
})
```

The motivation for this is to be able to register a configuration at any time without having to use the `@Configuration({...})` annotation when you define the server or the `PlatformExpress.bootstrap(Server, <configuration_here>)` function.

Thanks in advance 🙏