Feature request: Decode CaRT Files

There is not an easy way to view CaRT files in CyberChef, if at all.

It would be nice if a CaRT file could be extracted, which would show the CaRT metadata and provide access to the contained files. This works a bit, but only with manual modification.
```
Drop_bytes(0,60,false)
Take_bytes(0,6000,false)
RC4({'option':'Hex','string':'03 01 04 01 05 09 02 06 03 01 04 01 05 09 02 06 '},'Latin1','Latin1')
Zlib_Inflate(0,0,'Adaptive',false,false)
```

Of course, this can already be done with Python. https://pypi.org/project/cart/

Start with the manual Drop_bytes, Take_bytes, RC4 and Zlib_Inflate recipe in the issue, then compare its behavior with the linked Python cart package. Trace how CyberChef exposes file-parsing operations and add coverage for CaRT metadata and access to contained files; done means CaRT files can be decoded without manual modification.

Written by the indexing model from the issue text.