Show zone server addrs

[tertsdiepraam]

Adds the addresses for the zone servers in two places:

• Show the relevant review server in cascade zone status we are at a manual review
• Show all addresses in cascade status

We now also show multiple addresses under "Published zone available at" in zone status.

❯ cascade zone status example.com
zone:   example.com
policy: foo
source: /home/terts/data/zones/example.txt

review
  loaded: manual
  signed: manual

last published
  <no versions published yet>

status: waiting for loaded review
  ✔ load (serial: 2001062501)
  ■ review loaded zone
  |   zone must be reviewed manually
  |   loaded zone is available at:
  |     - 127.0.0.1:4540
  |     - [::1]:4540
  |   possible actions:
  |     cascade zone approve --unsigned example.com 2001062501
  |     cascade zone reject --unsigned example.com 2001062501
  |
  ○ sign
  ○ review signed zone
  ○ publish

❯ cascade status
Serving zones at the following addresses:
  Loaded review:
    - 127.0.0.1:4540
    - [::1]:4540
  Signed review:
    - 127.0.0.1:4541
    - [::1]:4541
  Server:
    - 127.0.0.1:4542
    - [::1]:4542

Signing queue:
  The signing queue is currently empty.

---

• If you are changing Rust code or integration tests (Cargo.*, crates/, etc/, integration-tests/, src/):
  • Did you run the integration tests with act through the act-wrapper (as described in TESTING.md)?

[ximon18]

LGTM!