Change SARIF output for Mutual Recursion

[deemp]

Hi!
Please, have a look at this issue and make the following changes to the sarif output for mutual recursion.

• Split the mutual recursion message. Make a list of locations (descriptions and code links) as here

• Use HTML in runs.results.locations.physicalLocation.artifactLocation.description.text when providing some code. See an example here

• Specify a region of the source code (see here). For now, it can be a random valid region.

• Use relative uri-s like here. I hope it works on Windows