load_balancer needs support to attach directly to network

[betelgeuse]

SUMMARY

The load_balancer module currently does not allow attaching directly to network but instead requires load_balancer_network to be used separately.

ISSUE TYPE

• Feature Idea

COMPONENT NAME

load_balancer

ADDITIONAL INFORMATION

- name: Load Balancer
  hetzner.hcloud.load_balancer:
    name: load-balancer
    location: hel1
    load_balancer_type: lb11
    network: network
    state: present

The REST API has support for specifying network directly.

https://docs.hetzner.cloud/reference/cloud#load-balancers-create-a-load-balancer

Attaching to network is rather slow so presumably this feature would speed things up (see #719)