Support cloning into issue editor

[knutwannheden]

I would (as an option) like to be able to clone an issue and be able to edit it in the GitHub issue editor before actually creating it.

[johnmurphy01]

@all-contributors please add @knutwannheden for ideas

[allcontributors]

@johnmurphy01

I've put up a pull request to add @knutwannheden! 🎉

[fharper]

Good idea! This is what I thought this extension would do, so I will look forward to this feature if implemented.