Generally support platform specific dependencies

[sschuberth]

Currently, the analyzer reports dependencies for the platform ORT runs on. While that might be somewhat okay for a local use of ORT, it might not be okay when running ORT in a pipeline / as a service. Because such a hosted ORT usually runs on Linux, but you might want to get Windows-specific dependencies, because that's the exclusive platform you build your product for.

This basically could be implemented by teaching ORT to "fake" / pretend to be running on a configurable platform. Then either only the desired, or even all (supported) platforms could be analyzed.

Another, very expensive, work-around would be to really run ORT on all supported / desired platforms, and merge the results.

In either case, we'd need to extend our data models to also capture the platform-specificity of a dependency.

[sschuberth]

FYI, this seems to be how the GitHub dependency submission API seems to deal with the issue (i.e. allow incremental uploads than amend existing ones).