WIP: Integrate KES agent

[fraser-iohk]

Description

WIP: Integrates the KES agent (https://github.com/input-output-hk/kes-agent) functionality into the node. This includes:

• A new command-line flag, --shelley-kes-agent-socket, taking a path to a running KES agent socket
• support for the new traces emitted by the KES agent client within consensus

This change is a work-in-progress, and the KES agent will likely go through additional changes before it's ready to merge.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. These may include:
  • golden tests
  • property tests
  • roundtrip tests
  • integration tests
    See Runnings tests for more details
• Any changes are noted in the CHANGELOG.md for affected package
• The version bounds in .cabal files are updated
• CI passes. See note on CI. The following CI checks are required:
  • Code is linted with hlint. See .github/workflows/check-hlint.yml to get the hlint version
  • Code is formatted with stylish-haskell. See .github/workflows/stylish-haskell.yml to get the stylish-haskell version
  • Code builds on Linux, MacOS and Windows for ghc-9.6 and ghc-9.12
• Self-reviewed the diff

Note on CI

If your PR is from a fork, the necessary CI jobs won't trigger automatically for security reasons.
You will need to get someone with write privileges. Please contact IOG node developers to do this
for you.

[github-actions]

This PR is stale because it has been open 45 days with no activity.