Implement AAOMergePhysBoneProvider for Avatar Optimizer integration

[Copilot]

Adds reflection-based provider to access AAO (Avatar Optimizer) MergePhysBone components for performance calculation. AAO's MergePhysBone is internal, requiring reflection to extract merged PhysBone data.

Implementation

• AAOMergePhysBoneProvider: Extends VRCPhysBoneProviderBase with reflection-based access to AAO's internal componentsSet field
• Type Resolution: Uses SystemUtility.GetTypeByName("Anatawa12.AvatarOptimizer.MergePhysBone") for proper type validation
• No Caching: GetPhysBones() fetches latest components on each call to ensure up-to-date data
• GetAsList() Method: Uses AAO's GetAsList() method on PrefabSafeSet to access components, matching AAO's own MergePhysBoneProcessor implementation
• Static Reflection Caching: All reflection results (Type, FieldInfo, MethodInfo) are cached statically across all provider instances for optimal performance
• Type-Safe Method Caching: GetAsList method cache validates declaring type to prevent mismatches
• Merging: Colliders and ignore transforms merged with .Distinct() for duplicate removal
• Simplified Properties: RootTransform returns component transform; MultiChildType always returns Ignore

Performance Optimization

• Static Type Cache: MergePhysBone Type looked up once and reused across all instances
• Static FieldInfo Cache: componentsSet field looked up once and reused across all instances
• Static MethodInfo Cache: GetAsList method looked up once with type validation and reused across all calls
• Significant performance improvement when creating multiple provider instances or calling GetPhysBones() repeatedly

Example Usage

// AAO MergePhysBone component from scene
Component aaoMergePhysBone = GetComponent<AAOMergePhysBone>();

// Wrap with provider
var provider = new AAOMergePhysBoneProvider(aaoMergePhysBone);

// Access merged PhysBones for performance calculation (always fresh data)
VRCPhysBone[] physBones = provider.GetPhysBones();
List<Component> allColliders = provider.Colliders; // Deduplicated across all PhysBones

Testing

8 test cases with mock AAO component covering:

• PhysBone array extraction from componentsSet using GetAsList() method
• Duplicate removal in colliders and ignore transforms
• Null filtering and empty array handling
• Component validation with proper type checking

Original prompt

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This section details on the original issue you should resolve

<issue_title>AAOMergePhysBoneProviderの実装</issue_title> <issue_description>### タスク概要

タイトルの通り。

背景・目的

元Isuueの通り。

技術要件

• AAOのMergePhysBoneコンポーネントを抽象化してアクセスするクラスを作成する
  • AAOのコンポーネントはinternalであるためリフレクションが必要なことに留意する
• マージ対象となるPhysBone配列の情報だけAAOから受け取る。他のパラメータは現状では無視してよい。
• パフォーマンス計算に必要なボーン情報やコライダー情報は、マージ対象のPhysBoneから得られる情報を単純に重複なしでマージしたものを返せばよい。

補足情報

No response

完了条件

ビルドエラーのないこと RoslynAnalyzerによる指摘がないこと</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes kurotu/VRCQuestTools#144

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