feat: sequencer processes transactions in phases (AztecProtocol#4345)

Turn public processor into a state machine to progress through the
phases:
1. Fee Prep
2. App Logic
3. Fee Distribution

Add abstract phase manager to hold common logic. 

Presently the Fee Prep and Fee Distribution phases are noops. 

In the logs you will now see:
```
aztec:sequencer:fee-preparation Handle 0f79ae7198b4ed85829f6881af69fc590ed986b528e74af252b3afe430172d99 with no-op +0ms
aztec:sequencer:application-logic Processing tx 0f79ae7198b4ed85829f6881af69fc590ed986b528e74af252b3afe430172d99 +0ms
aztec:sequencer:fee-distribution Handle 0f79ae7198b4ed85829f6881af69fc590ed986b528e74af252b3afe430172d99 with no-op +0ms
```