Feature: simple login to prime

[JannikSt]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces a simple login feature to Prime via the CLI while also enhancing the pods command with a retry mechanism for SSH connection availability. Key changes include:

• Registration of a new login command in the CLI main entry point.
• Implementation of a new login module (login.py) that handles RSA keypair generation and challenge-based authentication.
• Update to the pods command to wait (in a loop) for the SSH connection to become available.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/prime_cli/main.py	Registers the new login command.
src/prime_cli/commands/pods.py	Implements a retry loop for establishing an SSH connection.
src/prime_cli/commands/login.py	Adds login functionality using challenge-response authentication.