Provide the ability to remove code needed only in dev mode from the production bundle

### Which @angular/* package(s) are relevant/related to the feature request?

core

### Description

Several NgRx libraries have features/checks that are only used in development mode (e.g. store runtime checks, component store lifecycle hooks check, store devtools, etc).

### Proposed solution

Expose the `ngDevMode`/`isNgDevMode` variable to the public API, so it can be used in Angular libraries that have dev mode-related functionalities, but also in user codebases if needed.

This feature could significantly reduce the size of production bundles in many Angular codebases.

### Alternatives considered

Currently, we can use `ngDevMode` to remove dev mode-related logic from the production bundle in the following way:

```ts
declare const ngDevMode: boolean;
const isNgDevMode = typeof ngDevMode === 'undefined' || !!ngDevMode;

// ...

if (isNgDevMode) {
console.warn('@ngrx/store: ...');
}
```

However, this global variable is not part of the public API and it can be risky to rely on it.

Comienza en el core package de Angular siguiendo la implementación existente de ngDevMode/isNgDevMode y cómo se definen las exportaciones de la API pública. Revisa las comprobaciones que solo se realizan en desarrollo descritas en el issue y el comportamiento del production bundle. Se considera terminado cuando la variable está disponible públicamente para las bibliotecas de Angular y el código de usuario, con pruebas relevantes que confirmen el comportamiento previsto del production build.

Escrito por el modelo de indexación a partir del texto del issue.