Admin enrichment: PCU Groups, CreateDatabase, plus some cleanup/tidiness#212

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sl-at-ibm wants to merge 11 commits into

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Commits on Jul 3, 2026

pcu group id checks in CreateDatabase, WIP
sl-at-ibm
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removing duplicate class AstraDatabaseCloudProvider entirely and using CloudProviderType consistently everywhere
sl-at-ibm
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fix case-insensitive CloudProviderType deserialization|
sl-at-ibm
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removed serdes detail from pcugroup class attributes
sl-at-ibm
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move some option classes to Admin namespace: CreateKeyspaceOptions, DoesKeyspaceExistOptions, DropKeyspaceOptions, ListKeyspacesOptions
sl-at-ibm
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Final touches and full (manual) testing for the PCU-aware CreateDatabase
sl-at-ibm
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chore: add copyright header to all files still without it
sl-at-ibm
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