StarDatabase/StarDatabaseBuilder updates

[ajtribick]

• Split out the StarDatabaseBuilder into its own files to reduce header usage
• Make BlockArray into a standard library-compatible container
• Move StarDatabase, StarDatabaseBuilder into celestia::engine namespace

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
11 New Critical Issues (required ≤ 3)

See analysis details on SonarCloud

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