registration: Add ability to check if a specific extension version is loaded

registration: Add ability to check if a specific extension version is loaded

As it's quite common that extensions and skins interact with each other, it's
useful to have a simple way to check if an extension version satisfies a
given constraint, as extensions change over time.

Bug: T202955
Change-Id: I19f9713caf89d647072a2bd7d598e739be383f4a