feat: implements srv record type for azure private dns provider

[furkansb]

What does it do ?

It implements SRV record type for Azure Private DNS provider

Motivation

While External DNS itself has support for SRV records, Azure private DNS provider does not. It should already be supported, it is useful for exposing NodePort services.

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• [] it doesn't require documentation change

[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @furkansb. Thanks for your PR.

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[mloiseleur]

@furkansb You need to sign cla before we can take a look at this PR.