Created a separate type for EntityIds and utilized it

[improbable-dmitrii]

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Reminders (IMPORTANT)

If your change relies on a breaking engine change:

• Increment SPATIAL_ENGINE_VERSION in Engine\Source\Runtime\Launch\Resources\SpatialVersion.h (in the engine fork) as well as SPATIAL_GDK_VERSION in SpatialGDK\Source\SpatialGDK\Public\Utils\EngineVersionCheck.h. This helps others by providing a more helpful message during compilation to make sure the GDK and the Engine are up to date.

If your change updates Setup.bat, Setup.sh, core SDK version, any C# tools in SpatialGDK\Build\Programs\Improbable.Unreal.Scripts, or hand-written schema in SpatialGDK\Extras\schema:

• Increment the number in RequireSetup. This will automatically run Setup.bat or Setup.sh when the GDK is next pulled.

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