[FEATURE] [0.0.4-alpha] Add Configuration Validation Command

### Project
cortex-cli

### Description
Command to validate config.toml without running other commands.

### Use Case
```bash
$ cortex <command>
error: feature not available
```

### Proposed Solution
1. Implement the suggested feature

### Alternatives Considered
_No response_

### Impact
All users

### Additional Context
_No response_