fixes #21842

NestJS cannot resolve dependencies not known to the generated module without workarounds. This PR introduces the ability to specify providers when initializing the ApiModule.

A service injected into an implementation can now be specified with the providers parameter.

@Injectable()
export class TestService {
    hello(): string {
        return "Hello World";
    }
}

@Injectable()
export class PetService implements PetApi {
    constructor(private readonly testService: TestService) {}
}

@Module({
    imports: [
        ApiModule.forRoot({
            apiImplementations: {
                petApi: PetService,
            },
            providers: [
                TestService
            ]
        }),
    ],
    controllers: [],
    providers: [],
})
export class AppModule {}

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