WIP chore(provider): inline providers first steps

[ivankatliarchuk]

Description

It's most likely a good idea to inline providers, this will help to simplify operational support, and add support for --provider-<flag> instead of --<provider-name>-<flag> and similar

In this pull request

• renamed custom TTL constansts to defaultTTL
• removed declaration shadowing
• empty slice declarations using literals

Ideally providers should support

• DryRun
• ApiRate limiting
• Page Size
• TTL
• Caching

Relates

• Don't crash when cloudflare returns 502 #5225
• Allow global configuration of TTL #1829

follow-up:

• rename DryRun to dryRun where required
• review what else as common values we could add to docs

Checklist

• Unit tests updated
• End user documentation updated

[k8s-ci-robot]

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[ivankatliarchuk]

/label tide/merge-method-squash

[mloiseleur]

@ivankatliarchuk It's a good step !

The part renamed custom TTL constansts to defaultTTL is quite huge. Would you please set it into a separate PR, so the other changes can be (more) easily reviewed ?