Expose indexation status in NodeInfo endpoint

[rafal-ch]

Closes #2576

Description

This PR extends the nodeInfo GraphQL endpoint by adding the indexation field which allows to check whether a given indexation is enabled. Example response:

{
  "data": {
    "nodeInfo": {
      "utxoValidation": false,
      "indexation": {
        "balances": true,
        "coinsToSpend": false,
        "assetMetadata": false
      }
    }
  }
}

Before requesting review

• I have reviewed the code myself

After merging, notify other teams

• Rust SDK