[PoC] Single package release

[CarlosCortizasCT]

This PR implements a proof of concept about how we could configure this monorepo to publish just one package with all data models instead of every single data model package (@commercetools-frontend/test-data).

It tries to do that in a way that consumers can still consume packages individually by exporting different entry points.

Example:

import { ChannelGraphql } from '@commercetools-frontend/test-data/channel';

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Latest commit: 419d3c7

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