safe-global / safe-transaction-service / 9805166210

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Add ENS Subgraph configuration (#2105)

- Adds the possibility to add an ENS Subgraph configuration.
- The Subgraph requires an API key which can be obtained via The Graph interface (https://thegraph.com/docs/en/querying/querying-the-graph/)
- Adds three environment variables that should be used if The Subgraph support needs to be enabled:
  * `ENS_SUBGRAPH_URL` – the base url to query the subgraph from
  * `ENS_SUBGRAPH_API_KEY` – the API key that was obtained from The Graph
  * `ENS_SUBGRAPH_ID` – the subgraph id. An example of an ENS Subgraph can be found in https://thegraph.com/explorer/subgraphs/5XqPmWe6gjyrJtFn9cLy237i4cWw2j9HcUJEXsP5qGtH?view=Query&chain=arbitrum-one. To query this graph, you should use `5XqPmWe6gjyrJtFn9cLy237i4cWw2j9HcUJEXsP5qGtH` as the subgraph id.
- The ENS Subgraph configuration is only required if querying on `Mainnet`. 
- Support was added to `Sepolia` and `Holesky`. These two networks do not require an API key but should not be considered for production usage (rate limits might apply).
- If the current chain is `Mainnet` and the Subgraph configuration was not provided, a fallback for Mainnet is used. However, such fallback might be under stricter rate limits and should only be used in a testing environment. A warning is logged if the fallback option is used.

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