feat: add plainText to headings

[benjaminrobinet]

What does it do?

It allows to have access to the plainText of a heading block.

Why is it needed?

Sometimes you might want to have access to the plain text of a heading to be able to add an attribute to it, like for creating anchors to point to them.

How to test it?

In a frontend app, use the renderer (link it via yarn), and pass a custom component for heading that uses the plainText prop

Related issue(s)/PR(s)

Inspired by https://github.com/strapi/blocks-react-renderer/pull/17

[benjaminrobinet]

I'm gonna push a fix for that today ! Was thinking if it wouldn't be interesting to also pass the raw object (from the strapi response) to every block types. For now, we only have access to the React.Node

[benjaminrobinet]

no feedback on this @remidej ? any chance this get merged ? :)