Add plcat command to target-shell to read plist files

[JSCU-CNI]

This PR adds a small utility command to target-shell to pretty print the contents of Apple plist files.

[yunzheng]

What do you think of using plcat as the command name, mimicking plutil on macOS.

[Schamper]

What would you say about adding support for NSKeyedArchiver plist files? Using https://github.com/fox-it/dissect.util/blob/main/dissect/util/plist.py

[JSCU-CNI]

What would you say about adding support for NSKeyedArchiver plist files? Using https://github.com/fox-it/dissect.util/blob/main/dissect/util/plist.py

A previous version of this cmd actually used the NSKeyedArchiver, but that did not always work for (b)plist files I encountered.

[Schamper]

but that did not always work for (b)plist files I encountered.

Can you elaborate a bit further? Because our parser is borked or because of other reasons?