Add random number generation future

[b1sar]

I needed to generate multiple random numbers. I implemented it for my use case and thought this could be a useful feature for other users too. So here it is. Most of the code is inspired by the "WordList feature" pull request.

Btw, Typescript is not my main language and also it's my first time working with a vscode extension so I hope this is acceptable to some degree.

[jkjustjoshing]

I'm not set up at the moment to publish new versions to the VS Code Extension Marketplace, but I fully intend to merge and publish this change once I get that set up. If it hasn't happened in a couple weeks, feel free to ping me again.

[b1sar]

While using the extension, I realized it has some minor errors. So I'll create an another commit that hopefully will fix it. Also, maybe this could be a good opportunity to add tests too :) But before that, I think converting the pull request to draft would be better, for now.

I'll ping you when everything is okay.

[jkjustjoshing]

Sounds good! Thanks for the reminder about your PR, but I'll wait to hear back from you and the PR moving out of "Draft" mode to review again and merge.