feat(editor): add flag waitUserInput

[dellamina]

As requested in #1149, editor prompt always requires the user to press enter before launching the system editor, this pr adds a flag waitUserInput (default: true) that if set to false skips the user confirmation.

[SBoudrias]

Thanks!!

If you have some extra time, would you mind adding the flag to the new version of the editor prompt too? This would help me make sure we don't loose the feature once we ship the rewrite officially! The new code is over here: https://github.com/SBoudrias/Inquirer.js/blob/master/packages/editor/src/index.ts

[dellamina]

Sure, I actually have already done that but I wasnt able to find the test suite for the new version so I pushed the changes only for the js version. Can you give me a hint on how to test the new version?

[SBoudrias]

Ah yes, I didn't setup great testing infra for the new prompts; I only tested the core library so far. You can skip UTs for now; but if you're interested, you could take some time looking into how we could set that up... There might be some inspiration in this test here https://github.com/SBoudrias/Inquirer.js/blob/master/packages/core/test.ts - Passing a test stream and retrieving rendered info from there. I was planning to extract a simple reusable test interface in a package too to make it easier.