feat: SSHNP Params Controller

[XavierChanth]

- What I did

• Updated SSHNPParams and SSHNPPartialParams in order to enable the following features:
• Replaced the old home screen controllers with 3 new controllers in sshnp_config_controller.dart
  • One controller tracks the current file being created / edited
  • One controller tracks the list of all loaded profiles
  • One controller tracks the state of each SSHNPParams class (a family type provider)
• Made additional refactorings and updated the code to use these new controllers
  • Refactored the home screen and separated out various parts of logic to separate files
  • Updated the form screen
    - How I did it

- How to verify it

- Description for the changelog
feat: SSHNP Params Controller