[depends on #9331] buffer update opt: Integrate UboManager into the engine

[show50726]

To focus on the integration logic added in this PR, please ignore BufferAllocator and UboManager and their related tests. They were introduced in the base PR (#9331).

Changes

• Engine
  • The engine now owns the UboManager. It initializes it, calls its beginFrame/endFrame methods, and manages MaterialInstance slot retirement on destruction.
• MaterialInstance
  • Constructors are updated to accept a useUboBatching flag.
  • commit() now writes data to the shared buffer via uboManager->updateSlot.
  • use() now binds the shared buffer using its dynamic offset.
• Material
  • createInstance() methods are updated to pass the useUboBatching flag to the MaterialInstance.
• PostProcessManager
  • All calls to mi->commit(driver) are updated to mi->commit(driver, mEngine.getUboManager()) to pass the manager.
• Renderer
  • At endFrame(), it now notifies the UboManager to create a fence for GPU synchronization.
• filamat
  • Updated to set the DYNAMIC_OFFSET flag for the material's uniform buffer, so that it could update the offset without recreating the descriptor set.