[Feat.Req] Auto-upgrade by version upgrade message

[hopeyen]

Problem statement

Indexers can get notifications for the version upgrades. To automate the process of deploying the subgraph on graph-node, we should add this workflow in the radio.

Expectation proposal

• In the VersionUpgradeMessage handler, send POST request offchain of the upgraded subgraph hash.
  • condition on auto_upgrade, availability of indexer_management_server_url, and validity of the message
• Check indexingStatus from graph node to make sure the deployment is being synced
• Add E2E test

Related to #6