feat(#1033): Add possibility to prompt for variables

[KoljaTM]

Description

bru.prompt(varName, prompt) allows to specify variables that should be prompted in a pre- or post-request script

This is my first contribution to bruno, so I hope I got the implementation in accordance with the way things are supposed to be done. I am open to suggestions, e.g. if there would be a better way to implement this features or which kinds of test to include.

Contribution Checklist:

• [X ] The pull request only addresses one issue or adds one feature.
• [ X] The pull request does not introduce any breaking changes
• [ X] I have added screenshots or gifs to help explain the change if applicable.
• [ X] I have read the contribution guidelines.
• Create an issue and link to the pull request.

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[mjhcorporate]

I love this idea! Have you thought of a corresponding implementation for the cli?

[bSolt]

Can you add an option to make the prompted variable secret like for a standard html password input then bruno would save the var as type: secret?