[Feature]: List building blocks on explorer

[jacquesikot]

Is there an existing issue for this?

• [X] I have searched the existing issues

Summary

We are building in the capability to list all possible building blocks on the platform in the explorer as drag and drop items on the canvas. This task is the first set of tasks linked in the entire drag and drop building block experience.

Why should this be worked on?

It is one of the experiments we believe will improve the building blocks goal of accelerated learning for our users.