Update our SARIF support from 10-10 to 11-28.

Update our SARIF support from 10-10 to 11-28.

Functional changes include:

* The run.files property is now an array instead of a mapping.
* fileLocation objects now have a fileIndex property specifying the array index into run.files.
* The resource.rules property is now an array instead of a mapping.
* The result object was given a ruleIndex property that is an index into the resource.rules array.
* rule objects now have their "id" field filled out in addition to the name field.
* Updated the schema and spec version numbers to 11-28.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@349188 91177308-0d34-0410-b5e6-96231b3b80d8