Hetzner DNS service support

[21h]

I added some Hetzner support, but without tests right now. Tested on real account and it successfully works. Please review and say what you think.

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[miry]

@21h It looks good. I will check the code more later. Do you think you can start work on tests part?
It would great to have also some instructions how do you test changes?

[njuettner]

Hi thanks for adding a new provider to external-dns 👍. I would like you to add tests and documentation how to use it.
You can find docs in the docs folder for other provider.

[21h]

Hi thanks for adding a new provider to external-dns . I would like you to add tests and documentation how to use it.

I do not have much free time to make tests right now, but documentation will be soon.

[21h]

I am not kubernetes author, but let it be written like this

added license as in other files

[21h]

@njuettner ping

[njuettner]

Small nits and then we're good to go 🚀

[21h]

@njuettner

[njuettner]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 21h, njuettner

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[codeagencybe]

@21h
Hello

Could you create working integration for ClouDNS also? Does it take a lot of work?
https://cloudns.net