Update protocol parameters to SNARK friendly values - Phase 2

[jpraynaud]

Why

The current Mithril protocol parameters we use are not SNARK-friendly and need to be slightly updated. In particular, the k value is a bit too big and requires the usage of twice the number of constraints in the Halo2 circuit.
The new protocol has been crafted in #2813 parameters: k=1944, m=16948 and phi_f=0.2

What

Deploy the new protocol parameters to the pre-release and release Mithril networks

How

• Rollout the protocol parameters to the pre-release and release Mithril networks:
  • Phase 2
    • pre-release-preview (use loose parameters)
    • release-preprod (use loose parameters)
    • release-mainnet
• Add a dev blog post