Add `file` helper function to help import static payloads from files

[davidxbors]

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Please describe your feature request:

Add a file helper function, which receives a filepath as an argument and will return the contents of the file

Describe the use case of this feature:

This will help with static payloads, especially binary ones.

I would like to work on this feature too.

[GeorginaReeder]

Thanks so much for your suggestion @davidxbors , we'll take a look into this!

[ehsandeep]

@davidxbors thanks! indeed this is missing feature and would be helpful for binary input, feel free to work on this feature and possible a file helper in https://github.com/projectdiscovery/dsl