Remove redundant era conversion functions. Handle IO Exceptions in consensus queries. Refactor Cardano.Api.Convenience.Query to work in ExceptT e IO.

[carbolymer]

Changelog

- description: |
    - Remove redundant era conversion functions. Use `toCardanoEra` instead.
    - Add IO Exception handling to consensus query execution.
    - Refactor Cardano.Api.Convenience.Query to return `ExceptT e IO a` instead of `IO (Either e a)`

# 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...

Context

Make things more composable.

[smelc]

Nice 👍

[Jimbo4350]

@carbolymer have you checked with consumers of the api in IOG that they are not using the functions you have removed?

[carbolymer]

@Jimbo4350 no I haven't, because the removed functions can be simply swapped with toCardanoEra. I've mentioned that in changelog.