Create an interface for writing SARIF documents from within clang:
The primary intent of this change is to introduce the interface
clang::SarifDocumentWriter, which allows incrementally adding
diagnostic data to a JSON backed document. The proposed interface is
not yet connected to the compiler internals, which will be covered in
future work. As such this change will not change the input/output
interface of clang.
This change also introduces the clang::FullSourceRange type that is
modeled after clang::SourceRange + clang::FullSourceLoc, this is useful
for packaging a pair of clang::SourceLocation objects with their
corresponding SourceManagers.
Previous discussions:
RFC for this change: https://lists.llvm.org/pipermail/cfe-dev/2021-March/067907.htmlhttps://lists.llvm.org/pipermail/cfe-dev/2021-July/068480.html
SARIF Standard (2.1.0):
https://docs.oasis-open.org/sarif/sarif/v2.1.0/os/sarif-v2.1.0-os.html
Differential Revision: https://reviews.llvm.org/D109701
