Add rat_king_parser

[Ana06]

Details

I have recently analysed a XWORM backdoor and rat_king_parser identified the family and decrypted the configuration. My sample was not difficult to analyse with dnSpy, but it was still nice to have the configuration extracted by rat_king_parser to double check. I think we should add a package for rat_king_parser. It can be easily installed using pip, so we can use VM-Install-With-Pip to install it.

@mandiant/flare-vm what do you think about adding it to the default configuration of FLARE-VM?

[Ana06]

I think this is a good issue to test #1080. I suggest @sara-rn implements it together 😉