chore: multicall aggregation

[mfw78]

Background

The number of calls that may be required for polling during a block may be large, and this can cause momentary flooding of upstream RPCs (especially if doing so in parallel).

Details

Many of these calls can actually be aggregated together in "mega calls" using Multicall3 so as to reduce call overhead.

Acceptance criteria

• Polling requests aggregated and sent via Multicall3

[mfw78]

Look at using package: https://www.npmjs.com/package/ethers-multicall-provider