Add file splitting to EncryptedZip

[matterpreter]

It would be nice to be able to create archives <4GB to be able to exfil with Cobalt Strike.

[NotoriousRebel]

Any updates on this 😅

[matterpreter]

I have the logic to do the file chunking done as a standalone and just need to implement it here. I'll see about adding it soon.