[Prototype] Implement Blake Hashing for Mina Consensus Selection in o1js Circuit

[MartinMinkov]

LambdaClass needs to implement the Mina consensus selection algorithm in an o1js circuit. To achieve this, they require the Blake hashing function, which needs to be implemented as a gadget. We need to prototype this implementation and assess its feasibility, particularly focusing on performance and memory constraints.

Objective:

Prototype Blake hashing in o1js, evaluate its performance, and determine if it's suitable for use in the consensus selection algorithm implementation.

Key Points to Address:

1. Implement Blake hashing as a gadget in o1js.
2. Assess performance constraints, with a particular focus on memory usage.
3. Determine if the o1js implementation is feasible or if we need to switch to Snarky for native proving.