Feature Description

When I use MatIconRegistry, and I add an "iconSet" using "addSvgIconSet", I don't see any way of subscribing to what's internally doing: loading file -> generating an html/svg representation -> etc

And I don't know when all that computation has finished.

I'm using a little "hack" to subscribe to that workflow using:

matIconRegistry.getNamedSvgIcon(<name of icon I know it's in the iconSet>).subscribe(...)`

But that's kinda weak since I have to know the contents (what SVGs are included) in the iconSet.

I would like to have a robust API so that I can subscribe to that internal workflow and know when it has finished its calculations, something like:

matIconRegistry.addSvgIconSet(<icon_set_file>).subscribe(...)

Even more interesting, allow this registry to load multiple files at once:

matIconRegistry.addSvgIconSet([<icon_set_file_1>, <icon_set_file_2>...]).subscribe(...)

Use Case

Synchronize APP Icons configuration at bootstrap.

Thanks