refactor: rename ad data source

[kral2]

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Description

Rename Data source to be more descriptive: ad_list instead of ad, as suggested in PR #75:

You can get many ADs in multi-AD regions. I think this should be renamed to something like ad_list or something similar

New or Affected Resource(s)

Potential Terraform Configuration

# Copy-paste any Terraform configurations for how the requested feature may be used.

References