Add GetMemoryInformation request to kerncfg/posix

[Qwinci]

No description provided.

[avdgrinten]

Getting informative data from the kernel is better done by adding a kerncfg request. That way, we don't need to add a lot of additional syscalls, and it's easier to do access control and versioning.

[Qwinci]

I moved it to kerncfg like you suggested.

[qookei]

Seems fine to me, although I'm unsure if this is the right time to start using separate response messages instead of adding fields to the SvrResponse message.

[no92]

LGTM