feat(account): add new command to get billing summary

[MarinX]

Closes #339

Adds a new account billing command to retrieve and display billing information for a specific month and year.

Example usage

  upctl account billing --year 2025 --month 7
  upctl account billing --year 2025 --month 1 --resource_id <uuid>
  upctl account billing --year 2025 --month 1 --username <username>

./upctl account billing --year 2025 --month 10
  
  Currency:     EUR      
  Total Amount: 34.31849 
  
  Networks
    Total Amount:       3.255         
    IPv4 Address Total: 3.255         
    Resource 1 ID:      xxxx-xxxx-xxxx 
    Resource 1 Amount:  3.255         
    Resource 1 Hours:   744           
  
  Storages
    Total Amount:      23.064                               
    Storage Total:     23.064                               
    Resource 1 ID:     xxxx-xxxx-xxxx 
    Resource 1 Amount: 23.064                               
    Resource 1 Hours:  744                                  
  
  Servers
    Total Amount:      7.99949                              
    Server Total:      7.99949                              
    Resource 1 ID:     xxxx-xxxx-xxxx 
    Resource 1 Amount: 7.99949                              
    Resource 1 Hours:  672                                  

[kangasta]

Hello and thank you for another pull request!

I tried testing this, but got an error:

$ upctl account billing --year 2025 --month 11
✗ Command execution failed                                                                                                                                               
  Error: json: cannot unmarshal string into Go struct field BillingResourceDetail.servers.server.resources.details.firewall of type float64
Error: Command execution failed for 1 resource(s)

I guess that might be a bug on the Go SDK side, though. I'll try to dig the raw response data to see how it looks like 👀 Also got an successful result with earlier month.

[kangasta]

Overall, looks good to me, but I would tune the human readable output a bit 👍

[MarinX]

changed the output to table format.
added category total to summary.

  Summary:

     Resource     Amount
    ────────── ──────────
     Networks    0.37625
     Storages      2.666
     Servers     8.13787
     Total      11.18012

  Networks - IPv4 Address Resources:

     Resource ID      Amount   Hours
    ─────────────── ───────── ───────
     XX.XXX.XX.X   0.37625      86

  Storages - Storage Resources:

     Resource ID                            Amount   Hours
    ────────────────────────────────────── ──────── ───────
     XXXX-XXXX-XXXX    2.666      86

  Servers - Server Resources:

     Resource ID                             Amount   Hours
    ────────────────────────────────────── ───────── ───────
     XXXX-XXXX-XXXX   0.13838      31
     XXXX-XXXX-XXXX   7.99949     672

[kangasta]

Thank you for updating the output format and sorry for the delay in reviewing this! I'll try to move this forward during next week.