feat: [PRODUCT-503] [PRODUCT-504] show helpful messages during VM scheduling and startup

[sigmachirality]

When a VM is awaiting scheduling:

When a user has a VM less than 10 minutes old:

Additionally, adds --json flag support.

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
src/lib/vm.ts	16% smaller

[greptile-apps]

Greptile Summary

This PR enhances the VM listing command by adding informative messages to guide users during VM startup and scheduling phases. The changes improve user experience by:

1. Adding clear messages about VM scheduling status
2. Showing helpful information for VMs less than 10 minutes old
3. Implementing color-coded status indicators
4. Adding example commands after listing VMs
5. Providing better error handling with specific status codes

These changes integrate well with the existing VM management functionality in the CLI, addressing common user confusion around VM provisioning times and startup states. The code modifications follow the established patterns in the codebase for handling API responses and displaying information to users.

Confidence score: 4/5

1. This PR is safe to merge with minor monitoring recommended
2. Score based on low-risk UI improvements with good error handling, though new status checks could benefit from additional edge case testing
3. Files needing attention:
   • src/lib/vm.ts: Verify edge cases for VM age calculation and status detection logic

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