Feature request: add snippets for `async` functions

[OneHoopyFrood]

This is a feature request to include some snippets for async functions.

If I get some time I'll submit a PR.

Thanks for the extention! Just what I've been needing!

[equiman]

Actually, we have various snippets that use async.

Please https://github.com/deinsoftware/vscode-arrow-snippets#functions

Did you have a specific snippet to add?

[equiman]

Missing information.