New tracing: new features and some maintenance

[mgmeier]

Description

This PR adds several quality-of-life features to the new tracing system, as well as improve robustness or code quality in several places. Broken down by component, the changes contained are:

cardano-tracer:

• Implement Prometheus HTTP service discovery (SD) under the URL /targets
• Add optional config field "prometheusLabels": { "<labelname>": "<labelvalue>", ... } for custom labels to be attached with Prometheus SD
• Use TracerTrace.forMachine directly instead of going via derived TracerTrace.toJSON; remove unused TracerTrace JSON instances
• Use proper 'camelCase' for machine-readable TracerTrace
• Proper tracing (vs. dumping to stdout) for showProblemIfAny and for forwarding connection interruptions
• Remove redundant runInLoop in favour of trace-dispatcher's implementation
• Split up journal handler implementation into internal modules Systemd and NoSystemd (maintenance)

trace-forward:

• Provide InitForwardingConfig config record type for initForwarding and initForwardingDelayed

trace-dispatcher:

• class LogFormatting: remove redundant forHumanFromMachine and forHumanOrMachine (the system already does that inherently)
• Introduce type Cardano.Logging.Types.TraceMessage.TraceMessage with explicit codecs for JSON and CBOR
• Rework PreFormatted type and formatters to use TraceMessage; slightly optimize humanFormatter'
• Add CBOR formatting via FormattedMessage.FormattedCBOR constructor and a cborFormatter' function
• Replaced both disconnectedQueueSize and connectedQueueSize with queueSize in TraceOptionForwarder while keeping config parsing backwards compatible
• Add retry delay reset in runInLoop when the action runs sufficiently long
• Safely stop standardTracer's stdout thread when there are no more producers (re-enabling the cabal bench)

Additionally, the PR:

• removes any use of forHumanFromMachine and forHumanOrMachine from the cardano-node codebase, replacing it with forHuman only where appropriate
• implements proper tracing (vs. dumping to stdout) for forwarding connection interruptions in cardano-node and tx-generator

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

[jutaro]

A lot of changes, and I just have one question wit it. Otherwise it looks good

[jutaro]

LGTM