Support for SARIF formatted diagnostics

[Eli Zaretskii]

Hi,

In

  https://gcc.gnu.org/pipermail/gcc/2023-May/241566.html

a GCC developer asked whether Emacs can support compiler diagnostics
in SARIF format, which GCC 13 is capable of emitting (see towards the
end of that message).  I don't think we support that, do we?  If not,
I think it would be good to add such support, if someone wants to work
on that.

TIA