[DifficultyHash] Prepare for difficulty multiplier usage (#836)

## Summary

This PR prepares for claimed amount calculation to use the
`RelayDifficultyMultiplier`.
* It removes the `RelayDifficultyTargetHash` `proof` param.
* Replace `prooftypes.DefaultRelayDifficultyTargetHash` occurrences with
`protocol.BaseRelayDifficultyHashBz`.
* Moves the `RleayMiningDifficulty` logic to the `service` module due to
cyclic dependencies.
* Rename `num_compute_units` to `num_claimed_compute_units` and add
`num_estimated_compute_units` and `claimed_amount_upokt`
* Remove the no longer used tokenomics querier to retrieve a service
difficulty target hash.

The PR is only renaming and moving of files most (~13200LOC) changes are
auto-generated code.

## Type of change

Select one or more from the following:

- [ ] New feature, functionality or library
- [x] Consensus breaking; add the `consensus-breaking` label if so. See
#791 for details
- [ ] Bug fix
- [x] Code health or cleanup
- [ ] Documentation
- [ ] Other (specify)

## Testing

- [ ] **Documentation**: `make docusaurus_start`; only needed if you
make doc changes
- [x] **Unit Tests**: `make go_develop_and_test`
- [x] **LocalNet E2E Tests**: `make test_e2e`
- [ ] **DevNet E2E Tests**: Add the `devnet-test-e2e` label to the PR.

## Sanity Checklist

- [x] I have tested my changes using the available tooling
- [x] I have commented my code
- [x] I have performed a self-review of my own code; both comments &
source code
- [ ] I create and reference any new tickets, if applicable
- [ ] I have left TODOs throughout the codebase, if applicable