[pool] Evaluate using Alloy event watchers for chain tracking

[dancoombs]

Describe the feature
Alloy has an event watching feature.

We can consider replacing our chain tracking logic with this logic.

A few things to look out for:

1. Need to be able to watch for multiple event types on multiple contract addresses at the same time. Don't want to duplicate polling.
2. Needs to work on ws/http. We've defaulted to http in the past due to ws reliability/latency issues. We may want to re-evalutate this.
3. Needs to work with or without using eth_getFilterChanges as we've also seen reliability/latency/support issues with RPC providers implementations of this method.