feature: support migration from community provider

[mkjmdski]

Hello!
So far I have been using https://registry.terraform.io/providers/AegirHealth/netlify/latest/docs community netlify provider, as official one has not been a thing yet at time when I was configuring infrastrcture.
However the community project has been discontinued.
I'm looking forward to migrate my code to the official provider now, but I'm missing following features to be able to do that:

• creating a new site with custom domain
• connecting site to a deploy_key
• setting up build hook (I relay on triggering builds by hooks in custom workflows)

[ramonsnir]

See my comment here #39 (comment) for what's currently blocking us.

Adding deploy keys and build hooks is easy, but we'll hold off on that until we have a good solution for site creation (just due to priorities; no technical blocker on those).

[mkjmdski]

Thanks for letting me know, I hope you will get time soon to look into developing the provider as it looks promising!