Detect required PHP extensions from locked dependencies

[boesing]

Feature Request

Q	A
New Feature	yes
BC Break	no

Summary

In #58, we introduced the extension detection from composer.json.
However, I've seen a comment in #80 where a project had to add an extension to its .laminas-ci.json because it is required by a 3rd-party dependency.

I was thinking about that and I came to the conclusion, that it might be possible to iterate through the composer.lock packages to actually detect all PHP extensions from the require section of their composer.json.