[FEATURE]: Resolve contract names using nameservice

### Is there an existing issue for this?

- [X] I have searched the existing issues

### New feature

For registering contracts, we should try to resolve contracts using the nameservice system calls.

Ex.

```
🔓 > register_token koin
Contract 'pob' at address 15DJN4a8SgrbGhhGksSBASiSYjGnMU8dGL registered
```

This would allow for system contracts to be upgraded in band without needing a new rc file.

### Anything else?

_No response_

Start at the CLI path for the register_token command and trace how contract names are currently handled. Identify how nameservice system calls can be used during registration, then verify that a registered name resolves to the expected contract address and supports in-band system-contract upgrades.

Written by the indexing model from the issue text.