Update Unreal SDK to websocket 2.0

[JasonAtClockwork]

Description of Changes

• Updated the Unreal SDK and generated Unreal bindings for the websocket 2.0 protocol/model
  • Reworked DbConnectionBase to handle the updated message shapes
  • Switched subscription handling over to new message types and QuerySetId
  • Updated reducer to ReducerResult, removal of callbacks, and set reducer flags
  • Added event table support
• Baked in multi-module support replacing the old PR
  • Added functionality to generate module support for multiple folders in the Unreal project (add .Build.cs, .h, .cpp) using the --module-name
  • Add new configuration option for spacetime generate to handle module prefix
• Regenerated Unreal Blackholio/TestClient/QuickstartChat bindings
  • Rebuilt Unreal Blackholio's consume entity to use event tables

API and ABI breaking changes

• Unreal websocket/message handling updated to the new protocol
• Unreal generation now expects a real .uproject target and will stop immediately if project
  metadata is invalid instead of continuing past setup issues.

Expected complexity level and risk

3 - A large set of changes to update the websocket/message handling along with heavy codegen changes to handle multi-module support

Testing

Test coverage of the Unreal SDK will need expansion in a future ticket once our issues with flakiness on CI is resolved.

• Updated Unreal Blackholio
• Ran full Unreal SDK test suite
• Built new test project using the new --module-prefix