Replace websockets with zmq

[xjules]

Issue

• POC: testing feasibility of zmq.
• Refactor tests

Approach
Implementing router-dealer pattern with custom acknowledgments with zmq

• Server / router (ensemble evaluator) gets messages and keeps track of connected clients wherein in additional it sends ack message to dispachers to confirm that the message has been received .

• Dealer(s) = clients and dispatchers are sending messages to the router via:

send_multipart([b""] + [message.encode("utf-8") for message in messages])

which essentially batching multiple messages into one.

• dispatcher now send messages in chunks

• dispatcher always for acknolwedgment from the evaluator

• removing websockets, no more wait_for_evaluator

• Settup encryption with curve

• each dealer (client, dispatcher) will get a unique name

• PR title captures the intent of the changes, and is fitting for release notes.

• Added appropriate release note label

• Commit history is consistent and clean, in line with the contribution guidelines.

• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release