Allow `RenderTargetStrategy` to be shared across prefabs via ScriptableObject?

Problem

RenderTargetStrategy is a MonoBehaviour, so it can't be referenced across prefabs in the inspector. This makes sharing a PooledRenderTargetStrategy between panels in different prefabs awkward — you end up needing a scene singleton and a companion component to wire things up at runtime.

Suggestion

A thin RenderTargetStrategyAsset : ScriptableObject that holds pool configuration and manages the lifetime of the underlying runtime component. RivePanel would accept one alongside the existing RenderTargetStrategy field.

  [CreateAssetMenu(...)]
  public class PooledRenderTargetStrategyAsset : RenderTargetStrategyAsset
  {
      [SerializeField] private Vector2Int m_pooledTextureSize;
      [SerializeField] private int m_initialPoolSize;
      [SerializeField] private int m_maxPoolSize;

      private PooledRenderTargetStrategy m_runtimeInstance;

      public override RenderTargetStrategy GetOrCreateStrategy(GameObject host)
      {
          if (m_runtimeInstance != null) return m_runtimeInstance;
          var strategy = host.AddComponent<PooledRenderTargetStrategy>();
          strategy.Configure(m_pooledTextureSize, m_initialPoolSize, m_maxPoolSize, ...);
          m_runtimeInstance = strategy;
          return strategy;
      }
  }

The ScriptableObject stays thin — just config and a factory. The MonoBehaviour still does the actual work, so nothing about LateUpdate batching or render pipeline registration needs to change.

Start by reading the existing RenderTargetStrategy, PooledRenderTargetStrategy, and RivePanel implementations, then compare their lifecycle and inspector behavior with the proposed ScriptableObject asset. Done means a thin asset can share pooled configuration across prefabs while creating and managing the runtime strategy without changing LateUpdate batching or render pipeline registration.