Add option to re-lint as a vscode command and not on save

[Jakub Pryc]

Hello! As a user of auto-save I currently find the plugin hard to work with. Since it activates on every save a lot of times the file is not ready to be linted and an error message pops up. An option to keybind the re-linting of a file would be a huge quality of life improvement for programmers using auto-save.