Add Rapid7 Velociraptor artifacts plugin

[Zawadidone]

No description provided.

[Zawadidone]

I have a few questions:

• Why doesn't this work (https://github.com/fox-it/dissect.target/pull/698/files#diff-d21a3f7b5a8a12a1531cd0193f1d5d28eed550ad78782baaf78ce79f25b66631R135-R139)? The file uploads.json is mapped correctly and exists in the root filesystem of the target but the other files in the results directory do not.
• Why is there no record type dict, otherwise I will just use str? https://github.com/fox-it/dissect.target/pull/698/files#diff-b1b22daa6721c32ea013bfb6fcaabe0e1fc80d9d38988451a01e44503c7ac220R48

[Zawadidone]

@Schamper, I am trying to map files into a different location so that these files can be used by plugins.

• https://github.com/fox-it/dissect.target/pull/698/files#diff-d21a3f7b5a8a12a1531cd0193f1d5d28eed550ad78782baaf78ce79f25b66631R138
• https://github.com/fox-it/dissect.target/pull/698/files#diff-d21a3f7b5a8a12a1531cd0193f1d5d28eed550ad78782baaf78ce79f25b66631R142

The function target.fs.map_file triggers the exception FileNotFoundError when the mapped files are accessed, is this a known issue?

[Zawadidone]

@EinatFox can somebody take a look at this PR? I don't know if the code that I want to implement will even work.