diagnostics: support XML and JSON kinds of logical locations

diagnostics: support XML and JSON kinds of logical locations

gcc/ChangeLog:
	* diagnostic-format-sarif.cc (maybe_get_sarif_kind): Add cases for
	new kinds of logical location.
	* doc/libgdiagnostics/topics/logical-locations.rst: Add new kinds
	of logical location for handling XML and JSON.
	* libgdiagnostics.cc (impl_logical_location_manager::get_kind):
	Add cases for new kinds of logical location.
	(diagnostic_text_sink::text_starter): Likewise, introducing a
	macro for this.
	(diagnostic_manager_debug_dump_logical_location): Likewise.
	* libgdiagnostics.h (enum diagnostic_logical_location_kind_t): Add
	new kinds of logical location for handling XML and JSON.
	* libsarifreplay.cc (handle_logical_location_object): Add entries
	to "kind_values" for decoding sarif logical location kinds
	relating to XML and JSON.
	* logical-location.h (enum logical_location_kind): Add new kinds
	of logical location for handling XML and JSON.

gcc/testsuite/ChangeLog:
	* libgdiagnostics.dg/test-nested-logical-locations-json-c.py: New test.
	* libgdiagnostics.dg/test-nested-logical-locations-json.c: New test.
	* sarif-replay.dg/2.1.0-valid/3.33.7-json-example.sarif: New test.
	* sarif-replay.dg/2.1.0-valid/3.33.7-xml-example.sarif: New test.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>