resourceloader: Track state of page-style modules

resourceloader: Track state of page-style modules

This allows dynamically loaded modules to depend on page-style modules
without it causing the page-style module to be loaded a second time.

* New method Module::getType() indicates whether a module is
  a page-style module or supposed to be dynamically loaded.

* Emit warning from addModuleStyles() when given a module that is
  not a page-style module (to be enforced later)

Bug: T92459
Bug: T87871
Change-Id: I8b6c6a10d965e73965f877c42e995d04202524f3