feat: Add crowdloan contributors command and enhance create/view functionality

[circlecrystalin]

Summary

This PR adds comprehensive enhancements to the crowdloan functionality, including a new contributors listing command and improved create/view capabilities with custom call support.

Changes

New Features

• Contributors Command: Added btcli crowd contributors command to list all contributors for a specific crowdloan
  • Displays contributor addresses, contribution amounts, and identity information
  • Supports verbose mode for full addresses and precise amounts
  • JSON output support for programmatic access
  • Shows total contributions and contributor count

Enhancements

• Create Command: Enhanced crowdloan creation with custom call support

  • Added validate_and_compose_custom_call function for validating and composing custom substrate calls
  • Improved error handling and validation for custom call parameters
  • Better JSON argument parsing and validation

• View Command: Enhanced crowdloan view functionality

  • Improved display formatting and information presentation
  • Better handling of crowdloan details and status

Testing

• Added comprehensive unit tests for contributors functionality (test_crowd_contributors.py)
• Added unit tests for custom call validation (test_crowd_create_custom_call.py)
• Added end-to-end tests for contributors (test_crowd_contributors.py)
• Added end-to-end tests for identity display (test_crowd_identity_display.py)

Files Changed

• bittensor_cli/src/commands/crowd/contributors.py (new file, 265 lines)
• bittensor_cli/src/commands/crowd/create.py (187 lines added)
• bittensor_cli/src/commands/crowd/view.py (533 lines added)
• bittensor_cli/cli.py (158 lines added)
• Test files: 4 new test files with comprehensive coverage

Testing

• All unit tests pass
• All e2e tests pass
• Manual testing completed for contributors listing and custom call creation

Fix: #660

Contribution by Gittensor, learn more at https://gittensor.io/

[circlecrystalin]

@ibraheem-abe I hope you had a good weekend, I hope my update will be helpful for you, could you please review my pr?

[ibraheem-abe]

Thank you for the contribution!
We will review this and get back to you soon