feat(adguardhome): Add AdGuard Home provider

[gabe565]

Description

This PR adds an AdGuard Home provider, which manages DNS rewrite entries for AdGuard Home.

The provider uses AdGuard Home's JSON API to create/delete records. AdGuard Home only supports A/AAAA/CNAME DNS rewrites, so ownership is not supported (similarly to the PiHole provider).

Fixes #3243

Checklist

• Unit tests updated
• End user documentation updated

Example DNS Rewrites

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• ✅ login: gabe565 / name: Gabe Cook (1212386)

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[gabe565]

Oops, somehow I missed #3367 before now. I'll leave this open for now since my implementation:

• Uses URL rewrites instead of custom filtering rules. URL rewrites support CNAME records and are meant for rewriting DNS responses, so I feel they make more sense for external-dns. Also, the DNS rewrite API does not rely on string parsing.
• Supports skipping TLS validation
• Supports disabled authentication
• Adds flags for AdGuard Home config instead of solely using envs

Feel free to let me know if I should close this.

[k8s-ci-robot]

PR needs rebase.

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[mloiseleur]

Hello,

#3063 has been merged. A plugin for adguard is already available here.
=> I'm closing this PR.
/close

[k8s-ci-robot]

@mloiseleur: Closed this PR.

In response to this:

Hello,

#3063 has been merged. A plugin for adguard is already available here.
=> I'm closing this PR.
/close

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