Feature Request: Batch Calls

[bh2smith]

It would be super cool to facilitate the possibility of fetching token data (i.e. symbol, decimals) for a given list of token addresses and making a single batched eth_call in on request.

Similar work was done here: Basically input a list of addresses and making a list of request data before making the eth call:

https://github.com/cowprotocol/token-allocation/blob/b969f3e2ad48041f7459fed4d80527bb188f232f/src/fetch/contracts.py#L47-L75

The most relevant code block here was:

        for index, eth_address in enumerate(addresses):
            request_data.append({
                "jsonrpc": "2.0",
                "method": "eth_getCode",
                "params": [eth_address, "latest"],
                "id": index
            })
        response = requests.post(self.node_url, json=request_data)

I would volunteer to implement, but don't have time at the moment, recording this issue here in case someone wants to pick it up.

Cheers.