Reuse model field definitions across multiple blocks

[mhaack]

PoC to reuse a set of fields defined for the UE on multiple blocks to avoid defining common field & combos over and over again. This can be helpful to define buttons with type & links, images with alt text etc.

Test URLs:

• Before: https://main--aem-boilerplate-xwalk--adobe-rnd.aem.live
• After: https://model-reuse--aem-boilerplate-xwalk--adobe-rnd.aem.page

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Commits

* [ee345b1](https://github.com/adobe-rnd/aem-boilerplate-xwalk/commit/ee345b13503305148b1342faeee35cca2c7c3667) :white_check_mark: (latest)

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