EPIC: Update Producer Simulator to read a "recording" from a cloud bucket

[mattp-swirldslabs]

As an engineering running a simulator as a producer
I want the simulator to run a recording by reading data from a cloud bucket
So that I do not have to store large recordings on my local filesystem

• While talking with the MN team, they asked how they might use the simulator in their k8s cluster to send data through the BN and to the MN (listening as a consumer). The MN team will soon be reading block streams uploaded by the CN to cloud buckets. Adding the ability for the simulator as a producer to read the same data, from the same bucket would help them with their testing.
• Another helpful scenario: imagine we're troubleshooting an issue in mainnet or testnet where CN is sending problematic data. We could use the simulator to read the same, problematic block stream, from a bucket and replay it locally to test where the items break with the Block Node.

Tech Notes

• Since we will be persisting/writing to cloud buckets, we might wait until that work is done and then reuse some of it in the simulator to read from a cloud bucket. EPIC: Upload Blocks to Cloud Buckets (New Ph-2) #357