[CLI modules v2] kyma alpha module add - community #2818

Description

• Implement the kyma alpha module add command only for the core modules.
• Design the solution in accordance with the new CLI architecture guideline described here: https://github.com/kyma-project/cli/blob/main/docs/contributor/ADR/004-modules-package-architecture.md
• Keep the interface aligned with the proposed API: https://github.com/kyma-project/cli/blob/main/docs/contributor/ADR/003-module-user-interface.md

Acceptance Criteria

• The new add command should work the same as the old one (for the community modules). From the user perspective the behavior shouldn't change.