New finding JSON sample

[tuxology]

We need to provide a finding json sample to @NdibeRaymond so he can begin experiments with joern2sarif. There are sample Finding JSONs, but we need to give more realistic and simple JSONs coming from rule scripts

[tuxology]

There is a bug in joern2sarf which didn't allow me to generate the sarif yet: https://github.com/joernio/joern2sarif/issues/2 We'll wait for this to get fixed. Until then the test file in joern2sarif can be used: https://github.com/joernio/joern2sarif/blob/main/test/data/sample-joern.sarif

[tuxology]

@NdibeRaymond is also working on joern2sarif conversion to JS via #67