Epic: 🐢 Code Quality

[LHerskind]

The code quality of the sequencer client and sequencing contracts are not at part with what we expect. They are written with unnecessary abstraction and complexity. As the 🐢 will be dealing with a lot of changes in these sections to accommodate a validator client as well (committee members). We will be cleaning these up as part of those tasks.

### Tasks
- [ ] https://github.com/AztecProtocol/aztec-packages/issues/7837
- [ ] https://github.com/AztecProtocol/aztec-packages/issues/7849
- [ ] https://github.com/AztecProtocol/aztec-packages/issues/7866
- [ ] https://github.com/AztecProtocol/aztec-packages/issues/7896
- [ ] https://github.com/AztecProtocol/aztec-packages/issues/7692
- [ ] https://github.com/AztecProtocol/aztec-packages/issues/7821
- [ ] https://github.com/AztecProtocol/aztec-packages/issues/7850
- [ ] https://github.com/AztecProtocol/aztec-packages/issues/7622
- [ ] https://github.com/AztecProtocol/aztec-packages/issues/7868
- [ ] refactor: Optimize the inbox to be single contract