[proposal] Ability to import/export tasks

[mrmlnc]

Would be cool to provide ability to return tasks from the package. Something like:

import * as fg from 'fast-glob';

const tasks = fg.getTasks(['pattern1', 'pattern2'], options);

Maybe also we need think about ability to import tasks instead of patterns:

import * as fg from 'fast-glob';

const tasks = fg.sync([task1, task2], options);