[Code Health] fix: shared module gRPC return errors (#961)

## Summary

Ensure all shared message and query handlers return gRPC status errors.

## Issue

- #860 

## 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`
- [ ] **LocalNet E2E Tests**: `make test_e2e`
- [x] **DevNet E2E Tests**: Add the `devnet-test-e2e` label to the PR.

## Sanity Checklist

- [x] I have tested my changes using the available tooling
- [ ] 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

x/shared/keeper/msg_update_params.go

@@ -3,23 +3,34 @@ package keeper
 import (
 	"context"
 
-	sdkerrors "cosmossdk.io/errors"
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 
 	"github.com/pokt-network/poktroll/x/shared/types"
 )
 
 func (k msgServer) UpdateParams(goCtx context.Context, req *types.MsgUpdateParams) (*types.MsgUpdateParamsResponse, error) {
+	logger := k.Logger().With("method", "UpdateParams")
+
 	if err := req.ValidateBasic(); err != nil {
-		return nil, err
+		return nil, status.Error(codes.InvalidArgument, err.Error())
 	}
 
 	if k.GetAuthority() != req.Authority {
-		return nil, sdkerrors.Wrapf(types.ErrSharedInvalidSigner, "invalid authority; expected %s, got %s", k.GetAuthority(), req.Authority)
+		return nil, status.Error(
+			codes.PermissionDenied,
+			types.ErrSharedInvalidSigner.Wrapf(
+				"invalid authority; expected %s, got %s",
+				k.GetAuthority(), req.Authority,
+			).Error(),
+		)
 	}
 	ctx := sdk.UnwrapSDKContext(goCtx)
 	if err := k.SetParams(ctx, req.Params); err != nil {
-		return nil, err
+		err = types.ErrSharedParamInvalid.Wrapf("unable to set params: %v", err)
+		logger.Error(err.Error())
+		return nil, status.Error(codes.Internal, err.Error())
 	}
 
 	return &types.MsgUpdateParamsResponse{}, nil