mitigate inconsistencies from unknown graph-node feature support

[Theodus]

This is a temporary measure to mitigate inconsistencies that arise from indexers serving queries with different versions of graph-node. The gateway must enforce some feature set. This followup should be to support versioned queries (GIP-24) in indexer-service and the gateway.

TODO

• merge feat(indexer-service): Add graph-node version endpoint from status api graphprotocol/indexer#841, release to indexers ASAP
• add a config field for min_graph_node_version, enforce via a filter in indexing_status.rs.
• set minimum graph-node version to 0.33.0, but allow unknown graph-node version for now.
• transition to strict enforcement, after substantial indexer adoption of the updated indexer-service
• GIP-24
  • add indexer-service support for versioned queries
  • add the new version field to attestations, such that the gateway supports both for the transition period
  • add gateway support for the above

[Theodus]

blocked by graphprotocol/indexer-rs#527