[feature] be able to run multiple tasks in separate threads

[gabrielcsapo]

Motivation

Looking at the runTasks function, there is some room for improvement on systems that have multiple cores. Tasks could be threaded off using something like https://www.npmjs.com/package/piscina.

checkup/packages/cli/src/task-list.ts

Lines 97 to 113 in a11f17c

	async runTasks(): Promise<[TaskResult[], TaskError[]]> {
	let results = await this.eachTask(async (task: Task) => {
	let result;
	this.debug('start %s run', task.constructor.name);
	try {
	result = await task.run();
	} catch (error) {
	this.addError(task.meta.taskName, error.message);
	}
	this.debug('%s run done', task.constructor.name);
	return result;
	});
	return [(results.filter(Boolean) as TaskResult[]).sort(taskResultComparator), this._errors];
	}

[scalvert]

I'd prefer not to jump to using threads unless absolutely needed. Currently, the eachTasks function uses p-map, and unless there's a super compelling reason to switch, I'd prefer to leave this as is.

What problem are you trying to solve?