Cardano Updates

2409: Upgrade to cabal-3.4.0.0 for documentation r=newhoggy a=newhoggy



Co-authored-by: John Ky <[email protected]>

- Model a lower-level "weakly-typed" metadata, which is essentially
  just a JSON object.
- Model a level above this layer that translates from the
  "weakly-typed" metadata into a "strongly-typed" metadata.
- Use the "weakly-typed" metadata type in all lower-level areas:
  - The database/storage layer
  - The server layer
  - The webhook layer
  - All these layers don't care much about what form the metadata is
  in, and so the weak type is more appropriate here.
- Use the "strongly-typed" metadata type in the PR validator.
  - This is the only area where we want the stronger types.
- Shuffle tests around accordingly, write new tests.
- Cleanup the codebase a bit.

2409: Upgrade to cabal-3.4.0.0 for documentation r=newhoggy a=newhoggy



Co-authored-by: John Ky <[email protected]>

The old insert, for the most common case, required two round trips for
a database insert. This has been reduced to a single trip.

Closes: https://github.com/input-output-hk/cardano-db-sync/issues/529