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Add `/v1/:chainId/about/indexing` endpoint (#1826)

Adds a new `GET` `/v1/:chainId/about/indexing` endpoint for returning the indexer status relative to the current block timestamp:

```ts
type Response = {
  lastSync: string // timestamp of oldest block synced by singleton or ERC-20/721 indexers
  synced: boolean // if Transaction Service returns `true` both singletons and ERC-20/721 indexers
}
```

- Add `expirationTimeInSeconds.indexing` configuration
- Add `indexing` cache key
- Add `IndexingStatusSchema` with inferred type/builder
- Add `ITransactionApi['getIndexingStatus']` method and implementation
- Add `ChainsRepository['getIndexingStatus'] method
- Add `GET` `/v1/:chainId/about/indexing` route with entity
- Add appropriate test coverage

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