Populate one configuration depending on the given glob pattern

[olehan]

Is your feature request related to a problem? Please describe.
collect requires you to have a rollup.config.js in every single package, but sometimes packages have an orderly simple, and repetitive configuration files.

Describe the solution you'd like
A function in @azimutlabs/rollup that would populate one configuration depending on the given glob pattern.
Use case example would be:

// Root of the mono-repo
// rollup.config.js
import { fromWorkspaces, populate } from '@azimutlabs/rollup';
import { compose } from '@azimutlabs/rollup-config';
import { babel } from '@azimutlabs/rollup-config-babel';

export default populate(
  // Will consider every directories matching glob pattern `ui.*` under a `packages` directory a rollup workspaces.
  // (requires valid `src` directory and package.json to sort the compile order using dependency graph)
  ['packages/ui.*', babel('es')],
  ['examples/*', babel('cjs')],
);

Describe alternatives you've considered
We could give #41 more thoughts and stick to 1 package = 1 config.