add support for hetzner-cloud dns validation

[CaptivatingCat]

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• I have read the contributing guideline and understand that I have made the correct modifications

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Description:

Added support for the certbot-dns-hetzner-cloud Certbot plugin, kept other certbot plugin for the old api inplace.

Benefits of this PR and context:

This pull-request resolves issue #593

How Has This Been Tested?

Pulled and build image on a test server and the test sever was able to successfully generate a certificate using the new plugin

Source / References:

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[LinuxServer-CI]

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ghcr.io/linuxserver/lspipepr-swag:5.2.2-pkg-a0ca254d-dev-8b8b491df3b62f2b0aa98931ea62c55cdd055906-pr-596

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[LinuxServer-CI]

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[LinuxServer-CI]

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ghcr.io/linuxserver/lspipepr-swag:5.2.2-pkg-18f477c0-dev-0a6a7b51c647f3e65763e18a25179bb415f09a59-pr-596

[LinuxServer-CI]

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[LinuxServer-CI]

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[dl-team-ops]

thanks @CaptivatingCat!