[Feature] Support multiple ingestor nodes

Description

The graph node config file currently only supports a single block ingestor like so

[chains]
ingestor = "block_ingestor_node"

It would be great if we could configure different nodes to ingest different chains, for example have one node ingest mainnet(s) and another ingest testnet(s). One idea would be to use the same rule logic for assigning deployments to indexers.

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.

まず、Graph ノードの設定ファイルが [chains] の ingestor 設定をどのようにパースするかを追跡し、次に deployment を indexer に割り当てる既存のルールロジックを調べます。異なる chain 用に複数の ingestor ノードをどのように設定できるかを明らかにし、個別のノードが割り当てられた mainnet または testnet の chain を正常に ingest し、現在の単一 ingestor 構成を妨げないことを完了条件として定義します。