Add CLI for new ics27 `RegisterAccount` rpc

[damiannolan]

Summary

Add a CLI which creates and routes a new MsgRegisterAccount to the 27-interchain-accounts msg server.
This should follow a similar pattern used within the intertx module.

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged/assigned

[Anmol1696]

Would like to take this up