new tracing: various improvements

[mgmeier]

Description

This PR provides several small improvements derived from experience with trace-dispatcher both from an implementor's and an operator's perspective - thanks to @jasagredo for all the feedback.

The changes contained are:

• Add strict contramap' (infix alias >!$!<) to the API, capturing a common pattern to avoid unintentional space leaks when composing tracers
• Increased strictness when storing traced DataPoints
• Drastically reduced fallback value for forwarding queue capacity to minimize impact of forwarding service interruption on heap size and retention
• Removed the Forwarder backend from cardano-node's fallback configuration

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

[jasagredo]

Changes look fine to me