Add Netlify DNS provider for ACME DNS-01 challenges

Add Netlify DNS provider for ACME DNS-01 challenges: a task in LegoFlow-SWE (Harbor dataset). Users who manage domains with Netlify cannot currently use lego to obtain certificates via DNS‑01. We need a new DNS provider that integrates with the existing ACME client framework.

The task

Users who manage domains with Netlify cannot currently use lego to obtain certificates via DNS‑01. We need a new DNS provider that integrates with the existing ACME client framework.

Part of Lego-X/LegoFlow-SWE.