Expose component extensions via CAEDT

[adrifelt]

When debugging component extensions, it would be very useful to be able to see component extensions in the CAEDT. They can't be shown alongside "normal" extensions because there is no way to disable them, but perhaps they could be hidden by default. To toss out an idea: the option could go under the settings gear.

crbug.com/382525 asks to show component extensions in an about: page, but perhaps there is a way to expose them in the CAEDT.