Implement support for linting on change

[karthiknadig]

This is one of the most asked for features in python extension: microsoft/vscode-python#408

[dhruvmanila]

I think we already support this using the following setting:

lint.run = "onType"

And in VSCode,

{
	"ruff.lint.run": "onType"
}

Closing this as completed but let me know if you meant something else :)

[karthiknadig]

That is perfect.