[FEATURE] cleanup command that finds unused components and interactively deletes them

[JoernBerkefeld]

A new command that would use already set up dependencies between types to identify items that are no longer in use and the offers to delete them.

First, the user should be asked to re-retrieve everything.

I am imagining a multi-select list similar to selectTypes at the end of parsing all files in the local project folder, followed by the question if those should really be deleted.

The only known problems so far:

• dataExtensions that are used to load data from in SQL, ampscript or SSJS would currently not be recognized
• journeys don't state they have transactionalEmail as dependency. The link only exists in the code the other way round.
• content blocks in emails link back to their original key which can be irrelevant and in fact I've seen that those original blocks are sometimes outdated.