Unreal CodeGen - Missing Category attribute in a few places

[JasonAtClockwork]

Description

As per the pull request: #3897 the ModuleBindings/Types were missing Category="SpacetimeDB" which makes finding the details easier in Blueprint. With it missing from ModuleBindings in the SDK that means our codegen is missing them in some locations.

TODO

• Review the unrealcpp.rs to find any UPROPERTY() references that need updating