Eldritch Implement `file.read_binary`

[hulto]

Is your feature request related to a problem? Please describe.
We don't have a way to read a file into a binary format from disk.
This has made developing tomes for BOF and .NET really frustrating since I need to recompile golem every time.

Describe the solution you'd like
Create an eldritch function file.read_binary(src: str) -> List<int>
Should be similar to the assets.read_binary feature added in this PR: https://github.com/spellshift/realm/pull/740/files

Describe alternatives you've considered
na

Additional context
na