refactor(proxmox): support for PAM authentication
- Added support for username and password authentication alongside existing token-based authentication.
- Updated validation rules to require either token or username/password for authentication.
- Modified the Init function to handle session creation based on the selected authentication method.
- Increased timeout duration for context in the Init function.
- Modified functions to accept context.Context as a parameter for better context management.
- Updated Init methods in Proxmox and Config to use the provided context.
- Adjusted UpdatePorts and NewProxmoxProvider to utilize the context for operations.
- Modified Config structs in various packages to replace string fields with strutils.Redacted to prevent logging sensitive information.
- Updated serialization methods to accommodate new data types.
- Adjusted API token handling in Proxmox configuration.
