Make the scan results an output of the reusable workflow

Hi,

I am trying to create a workflow that would post-process the results produced by `osv-scanner-reusable`. It seems relatively easy to put the content of the results.json file in an output variable judging from the [documentation](https://docs.github.com/en/actions/how-tos/reuse-automations/reuse-workflows#using-outputs-from-a-reusable-workflow). I can create a PR for it but I wanted to check first if others think it's a feature that would makes sense for `osv-scanner-action`? Or maybe there's already an easy way to access the results from my own workflow steps and I missed it.

Cheers,

Tom