@typescript-eslint/no-throw-literal: Enable allowThrowingUnknown option

[fregante]

This piece of configuration is currently blocking plain code like:

try {
	sorry()
} catch (error) {
	if (isCanadian(error)) {
		return;
	}

	throw error; // ERROR error
}

[sindresorhus]

I think you should open an issue on the ESLint TypeScript project. Ideally, there should be an option called allowRethrowingUnknown. I think allowing throwing unknown in general is pretty unsafe, but I'm ok with allowing this for now.