[NEW ENDPOINT] /State - return a state with latest block and timestamp for the data

[ashachaf]

For sanity check, we should create a new endpoint where it just returns the latest block and timestamp of that block used for the dataset available in all other api endpoints.

reason, this will allow a way to quickly identify if there is any stale data that is used or any service that isnt working as expected in harvesting the required data.

alternatively, we can append this information to any existing api endpoint to indicate the freshness of the returned data.

endpoint:

/state

returns:

[
    "blockNumber": 20906564,
    "timestamp": 1728218363
]