SDK visitor does not provide key information for visiting dictionaries such as the 'files' table

By spec, the key that stores some objects (such as file data instances) itself comprises an object member that may not be persisted to the object itself. The key of a file data instance, for example, may be the uri of the file data object (which doesn't need to be recapitulated in the object, in order to keep the format as compact as possible).

The result is that on visiting file data instances, an override may not have some object data expressed elsewhere. We should change the visitor to pass the key data for this case. This issue occurs with logic locations, files, and rules tables, minimally.

Start with the SDK visitor implementation and the SARIF specification's rules for dictionary keys and object members. Trace visits for logic locations, files, and rules, then verify that each visitor override receives the associated key data, including file URIs where applicable.