Add tenant app catalog & add/remove site app catalog (bis🧐)

[nicodecleyre]

Soooooo, i did a little oopsie woopsie and totally broke the other PR 😅

🎯 Aim

This feature adds the possibility to add a tenant app catalog of it doesn't exist and the possibility to add or remove a site app catalog

📷 Result

✅ What was done

clarify what was done and what still needs to be finished ex. [Remove this line]

• [X] Adding feature to add a tenant app catalog - if none exist
• [X] Adding feature to add a site app catalog
• [X] Adding feature to remove a site app catalog
• [ ] A feature to choose from existing sites as dropdown when adding a site catalog - this would be a nice issue - currently i didn't succeed in this as i couldn't parse the looooong json getting back from the cli command sites list

🔗 Related issue

Closes: #360

[Adam-it]

@nicodecleyre we just had another minor release due to SPFx version update. May I kindly ask you to rebase before we proceed

[Adam-it]

@nicodecleyre can you provide some update on this PR? Is there anything I may help you with or needs more clarity to proceed?