gRPC: Add tracing datatypes

[carbolymer]

Changelog

- description: |
    Add `SerialiseAsRawBytes Word64` instance to `Cardano.Api.Serialise.Raw`
    Add `Text reexport to `Cardano.Api.Pretty. Add `DecoderError` reexport to `Cardano.Api.Serialise.Cbor`
    gRPC: Add tracing datatypes
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
   - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - refactoring    # QoL changes
  # - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...
# uncomment at least one main project this PR is associated with
  projects:
   - cardano-api
  # - cardano-api-gen
   - cardano-rpc
  # - cardano-wasm

Context

The changes are integrated in IntersectMBO/cardano-node#6273

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff

[Jimbo4350]

Strongly opposed to the default language extensions. Other than that LGTM.

[Jimbo4350]

I prefer per module explicit language extensions at the top of the module.

[Jimbo4350]

Is there no haskell library that does this?

[carbolymer]

I was not able to find one. Existing ones like cereal or binary assume the constant size for a type i.e. Word32 is always 32 bytes. This encoding uses variable length. So either I'd have to pad it with leading zeroes or just use simple BS.foldl' (\acc b -> acc shiftL 8 .|. fromIntegral b) 0