Add support for Sarif output

[mridang]

As more and more tools take advantage of the SARIF output, it would be handy if this nohttp could do the same. https://github.com/microsoft/sarif-tutorials

[rwinch]

Thanks for the report. While this sounds interesting, I don't see the project implementing the standard unless it is contributed as we don't have the resources to do it. If this is something you or anyone else is interested in, please put together a more detailed plan on this issue and I can help guide you to see if we want to accept the contribution and then on getting it merged.