Add command to insert ignore line for linting errors

Some linting rules indicate potential errors and thus it's not uncommon to have to add e.g. "eslint-disable-next-line". It would be cool if there was a command you could run which would insert this for you based on actual errors.

E.g. see `eslint.codeAction.disableRuleComment` from https://github.com/Microsoft/vscode-eslint