Come up with strategy around multicall batch sizes

[Siegrift]

Batch sizes are likely going to be different per provider as they can apply their own limits. We need to set the limit for multicalling active dAPIs.

See this thread for reference.

[bbenligiray]

A similar concern is eth_getLogs limits and providers used in an Airnode config. We just set a blanket limit for the chain there and weed out the providers that don't work with it.

[aquarat]

Could we maybe do a quick benchmark when Airseeker starts?

[aquarat]

It was decided to hardcode batch sizes to 10.