code lens: add a 'run' code lens for main functions

[stamblerre]

See the original feature request: microsoft/vscode-go#3074.

[zhylmzr]

This feature is very helpful for single file and implementation inspiration.

[hyangah]

Should it run in the single file mode, or run the package?

[AntBlo]

I'd find this useful for cmd/*.go files. I believe I've seen tests that have run/debug code lenses.
Having the same feature for main seem like a good idea to me.

[hyangah]

@vuon9 Thanks for the PR!

I see the current implementation is similar to run test codelens,
creates a dedicated output channel called "Go Main" and forwards go run . output to stdout/stderr.
I now wonder if that's too limiting for a run test though.

What do you think about utilizing the task provider (https://code.visualstudio.com/api/extension-guides/task-provider)?
I guess that may allow access to stdio (including `stdin) and also open up the possibility of users can customize further to add environment or arguments.

[gopherbot]

Change https://go.dev/cl/393454 mentions this issue: add codelens for running main func

[polinasok]

Is it odd that Run: Start Without Debugging uses dlv with noDebug while the codelens will use "go run"?

[tooltitude-support]

We implemented this feature in our extension, tooltitude. We focus on augmenting gopls with convenience and productivity features.

We use the machinery provided by go extension under the hood, i.e. we just create a debug configuration and launch it, or just launch via shell task in the run case.

P.S. You could read more about it here: https://www.tooltitude.com/ You could install from here: https://marketplace.visualstudio.com/items?itemName=tooltitudeteam.tooltitude

cc @zhylmzr @AntBlo