[Feature] Copy a subgraph at specific block height

Description

Copying a subgraph at a specific block height would allow for an elegant alternative to rewinds when a divergence is identified in a subgraph.

Proposed workflow
1 - Identify divergence point N
2 - copy subgraph at block height N
3 - Allow graph-node to fully sync the copy
4 - Verify that the divervence is resolved
5 - use graphman copy activate to gracefully direct traffic to the corrected subgraph

Are you aware of any blockers that must be resolved before implementing this feature? If so, which? Link to any relevant GitHub issues.

No response

Some information to help us out

• Tick this box if you plan on implementing this feature yourself.
• I have searched the issue tracker to make sure this issue is not a duplicate.

既存のエントリーポイント graphman copy activate から始め、subgraph のコピーがどのように表現され、同期されるかを追跡します。ブロック高 N のコピーを rewind に依存せずに作成し、完全に同期し、検証してアクティブ化する方法を定義します。提案したワークフローがエンドツーエンドで機能すれば完了です。