Add Netlify API support

[draevin]

Add support for the Netlify API to issue certs for use in other contexts

[auto-comment]

First, NEVER send a PR to master branch, it will NEVER be accepted. Please send to the dev branch instead.
If this is a PR to support new DNS API or new notification API, please read this guide first: https://github.com/acmesh-official/acme.sh/wiki/DNS-API-Dev-Guide
Please check the guide items one by one.
Then add your usage here: https://github.com/acmesh-official/acme.sh/wiki/dnsapi

Or some other wiki pages:
https://github.com/acmesh-official/acme.sh/wiki/deployhooks
https://github.com/acmesh-official/acme.sh/wiki/notify

[draevin]

Created #3088 for tracking
Revised wiki adding a new item to include the appropriate steps

[Neilpang]

please add issue #3088 to the wiki page: https://github.com/acmesh-official/acme.sh/wiki/dnsapi#115-use-netlify-api

[draevin]

Added 👍