Accept any iterable in `RequestProvider.addRequests`

[janbuchar]

See https://github.com/apify/crawlee/blob/a228145b583d672fa584d9bd54f1859bd73077af/packages/core/src/storages/request_provider.ts#L195-L195

If we modify this method (and also addRequestsBatched) to accept any iterables, such as generators, we can make bulk insertion of large amounts of requests more memory efficient.

[B4nan]

this might be handy https://github.com/mikro-orm/mikro-orm/blob/master/packages/core/src/utils/Utils.ts#L445-L451