Create package for centra mock data

[alexanderflink]

Suggested name @noaignite/centra-mock-data

Suggestions on imports:

import { products, selection } from '@noaignite/centra-mock-data'

[maeertin]

suggestion: Perhaps even @noaignite/centra-mocks as the package name? Less to write ;) Additionally, we might include utils / generator functions for the mocks (not just data).

[maeertin]

Initial package now created.