chore: parallelise intra-block processing

[mfw78]

Background

Intra-block processing is slow when analysing / polling conditional orders.

Details

Re-arrange intra-block processing such that all owners, and their conditional orders, are processed in parallel. There is additional scope here as well in which to modify the polling to return the ABI required for the polling such that polling requests could be aggregated in large multicall to alleviate RPC load.

Acceptance criteria

• Intra-block processing is parallelised.