Support sending payload files on tests

[luizhenriqueandrade]

Is your feature request related to a problem? Please describe.
It's a feature that artillery already has, it would be a great feature for predator because others competitors don't have anything similar to this.

Describe the solution you'd like
On UI - support drag-and-drop to add CSV files, to make it more user-friendly.
On API - passing an option with the file path.

Describe alternatives you've considered
For example, sending a CSV, with usernames and passwords, file before running a test, which populates an array that is used on the test.

Additional context
the artillery docs: https://artillery.io/docs/script-reference/#payload-files

[enudler]

hi @luizhenriqueandrade
sounds like a good feature.

[enudler]

merged to master,
will be released in 1.4.0