Can't use lexicon with pending Cloudflare domains

[vjagaro]

I cannot use Lexicon with a domain that is pending (not active) in Cloudflare. It's useful to to be able to manipulate DNS records for pending domains before changing nameservers to minimize disruption.

Context

1. Add a domain (e.g., example.com) in Cloudflare.
2. Do not change the nameservers for example.com to point to Cloudflare so that it remains with a pending status.
3. Add an API token in Cloudflare with Zone.DNS Edit and Zone.Zone Read permissions.

Example

$ lexicon --version
lexicon 3.12.0
$ lexicon cloudflare --auth-token abc...XYZ list example.com A
Traceback (most recent call last):
  File "/home/user/.local/bin/lexicon", line 8, in <module>
    sys.exit(main())
  File "/home/user/.local/pipx/venvs/dns-lexicon/lib/python3.9/site-packages/lexicon/cli.py", line 132, in main
    results = client.execute()
  File "/home/user/.local/pipx/venvs/dns-lexicon/lib/python3.9/site-packages/lexicon/client.py", line 81, in execute
    self.provider.authenticate()
  File "/home/user/.local/pipx/venvs/dns-lexicon/lib/python3.9/site-packages/lexicon/providers/base.py", line 73, in authenticate
    self._authenticate()
  File "/home/user/.local/pipx/venvs/dns-lexicon/lib/python3.9/site-packages/lexicon/providers/cloudflare.py", line 51, in _authenticate
    raise AuthenticationError("No domain found")
lexicon.exceptions.AuthenticationError: No domain found