feat: Add CLI to group module (#10663)

## Description

Closes: #9899



---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [x] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [x] provided a link to the relevant issue or specification
- [x] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [x] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [x] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

x/group/client/cli/util.go

@@ -0,0 +1,38 @@
+package cli
+
+import (
+	"io/ioutil"
+
+	"github.com/cosmos/cosmos-sdk/client"
+
+	"github.com/cosmos/cosmos-sdk/x/group"
+)
+
+func parseMembers(clientCtx client.Context, membersFile string) ([]group.Member, error) {
+	members := group.Members{}
+
+	if membersFile == "" {
+		return members.Members, nil
+	}
+
+	contents, err := ioutil.ReadFile(membersFile)
+	if err != nil {
+		return nil, err
+	}
+
+	err = clientCtx.Codec.UnmarshalJSON(contents, &members)
+	if err != nil {
+		return nil, err
+	}
+
+	return members.Members, nil
+}
+
+func execFromString(execStr string) group.Exec {
+	exec := group.Exec_EXEC_UNSPECIFIED
+	switch execStr {
+	case ExecTry:
+		exec = group.Exec_EXEC_TRY
+	}
+	return exec
+}

x/group/client/testutil/cli_test.go

@@ -0,0 +1,18 @@
+//go:build norace
+// +build norace
+
+package testutil
+
+import (
+	"testing"
+
+	"github.com/cosmos/cosmos-sdk/testutil/network"
+
+	"github.com/stretchr/testify/suite"
+)
+
+func TestIntegrationTestSuite(t *testing.T) {
+	cfg := network.DefaultConfig()
+	cfg.NumValidators = 2
+	suite.Run(t, NewIntegrationTestSuite(cfg))
+}