WIP: feat(azure): add ARO-HCP Taskfile automation for dev workflows

[devguyio]

What this PR does / why we need it:

Adds Taskfile-based automation for ARO-HCP development under hack/aro-hcp/. Provides modular tasks for managing Azure infrastructure, AKS clusters, HyperShift operator deployment, and hosted cluster lifecycle.

Key features:

• Modular task structure with prereq, keyvault, oidc, dataplane, aks, dns, operator, and cluster task files
• Example configuration files for credentials and environment setup
• Comprehensive README with prerequisites and workflow documentation

Which issue(s) this PR fixes:

Fixes

Special notes for your reviewer:

Checklist:

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.
• This change includes docs.
• This change includes unit tests.

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✨ Finishing touches

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