Support setting values from files using the --set-file flag

[cbring]

The problem I'm trying to solve:
I would like support for the --set-file flag already existing in Helm https://helm.sh/docs/helm/helm_upgrade/#options.

This would be useful for including configuration files for example.

How I imagine it working:
The config parameter would be available for upgrade,install and lint commands and could be called something like file_values (needs to be distinguished from values_files).

Should accept a list<string> similar to the other configurable values-parameters.