Prepare deprecation of ProtocolParameters

[smelc]

Changelog

- description: |
    Prepare deprecation of ProtocolParameters: deprecate a number of functions producing them
# 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

• This PR deprecates the ProtocolParameters type, as well as functions that produce values of type ProtocolParameters.
• We want to remove ProtocolParameters ultimately (this is Deprecate cardano-api's ProtocolParameters #384)
• Corresponding CLI PR that stops using the deprecated functions: Remove call to checkProtocolParameters cardano-cli#780

How to trust this PR

It's only comments

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• Self-reviewed the diff

[Jimbo4350]

LGTM! One minor comment.

[Jimbo4350]

We should indicate in all the deprecation pragmas that we can access this type via the module Cardano.Api.Ledger

[smelc]

@Jimbo4350> done 👍