Right now util::terminate is hard-coded to print the realm-core version and point users to the realm-core GitHub issue tracker to submit the crash report.

This is inefficient because the SDK engineers do not monitor the realm-core repository when doing community support and the additional overhead required for Core engineers to try and triage the report imposes unfortunate delays in resolving the original issue.

We should provide an interface for SDKs to augment the message util::terminate generates with some general information like SDK type and version, platform version, etc., which should both help users by directing them to the right issue tracker, and give support engineers some more useful information when triaging.