Epic: Logs Refactor

[iAmMichaelConnor]

Following lots of discussion and debate, here are some decided tasks.

These tasks mostly span @nventuro and @LeilaWang 's teams. Feel free to decide amongst yourselves who does what :)

aztec.nr

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1. Limit each log to have at most N fields. #9586
   C-aztec.nr team-turing +2
   
2. Refactor outgoing log derivation and discovery to be independent of incoming logs.
3. More examples of using "encrypted logs" (to be renamed) (not note logs).
4. Review unconstrained ContractClassRegisterer log hash #8978
   A-security C-aztec.nr team-fairies +3
   

Circuit

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1. Change output databus to allow an array of N-field log preimage instead of a single log hash. #9587
   C-protocol-circuits team-turing +2
   
2. Merge note_encrypted_logs and encrypted_logs into a single private_logs in private tail. #9588
   C-protocol-circuits team-turing +2
   
3. Rename unencrypted_logs to public_logs and remove it from private. #9589
   C-protocol-circuits team-turing +2
   
4. Add a separate array of logs for bytecode. #9590
   C-protocol-circuits team-turing +2
   
5. Spike: can multiple logs point to a single note, to be squashed together?

PXE

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1. Differentiate the type of decrypted private logs.

General

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1. Decide what N is.