Make the list of blocks configurable

Problem/Motivation

All top level components (organisms) are exposed as blocks, there is no way to exclude components.

At the same time, none of the lower level components (atoms and molecules) are excluded, and there is no way to include them.

Proposed resolution

Implement an allow / block list for components, similar to the one on CL Selector Field.

User interface changes

Let's also add an indication in the audit page of the capabilities enabled to each component. This could be achieved via an hook that each module in the ecosystem can implement.