Get content type by using google magika

[borsna]

Use https://github.com/google/magika to check mimetype and block if the mimetype is in the configured block list.

Availible for python, rust and js, for .net we need some bindings:
https://securityresearch.google/magika/cli-and-bindings/other-bindings/

[borsna]

@andre-jernung also sugested to use libmagic that have a .net wrapper:
https://www.nuget.org/packages/Mime

example of usage:
https://github.com/hey-red/Mime