perf: Update offchain signature with POSEIDON hash

[akhercha]

Feature Request

Current behavior

At the moment, our offchain batch signature of entries uses the Pedersen hash. Which is O(n) and thus is a big bottleneck when a publisher wants to publish a lot of entries in one batch.

With the recent starknet.py bump, we can now use the Poseidon hash, which gives us ~60% better performances.

We recently made some investigations here:
astraly-labs/pragma-node#83 (comment)

Expected behavior

We want to update the revision field here to 1 so the Poseidon hash is correctly used by starknet.py.

This requires synchronisation with the pragma-node, we will need to update the way we check for signature correctness, see:
astraly-labs/pragma-node#87

After that, test properly a publishing process from the price pusher to the API to be sure everything is ok.