Update the `n2c Local Message Notification` mini-protocol in DMQ

[jpraynaud]

Why

The n2c Local Message Notification mini-protocol must be updated by removing the MsgServerDone message. This message is not necessary as the server side is able to maintain arbitrary long agency until it has some information to send to the client side.

What

Remove the MsgServerDone message in the n2c Local Message Notification mini-protocol.

How

• Update the Haskell node (already done)
• Update the CIP-0137:
  • Prepare a PR
    • MsgServerDone in the n2c Local Message Notification mini-protocol
  • Ask for review for the PR
  • Merge the PR
• Update the Pallas library
  • Prepare a PR
    • Adapt the n2c Local Message Notification mini-protocol without MsgServerDone
  • Ask for review for the PR
  • Merge the PR
• Update the Mithril nodes:
  • Adapt the implementation of the consumer server in the mithril-dmq crate