feat(Provenance): Add a LocalProvenance sub-interface

In contrast to the previously added `RemoteProvenance` stands the
`LocalProvenance`, which has no remote source, but instead references
a local input of some kind.

See [1] for more context on the new Provenance Hierarchy.

[1]: oss-review-toolkit#8803 (comment)

Signed-off-by: Jens Keim <[email protected]>

Author: pepper-jk

model/src/main/kotlin/Provenance.kt

@@ -45,6 +45,8 @@ sealed interface KnownProvenance : Provenance
 
 sealed interface RemoteProvenance : KnownProvenance
 
+sealed interface LocalProvenance : KnownProvenance
+
 /**
  * Provenance information for a source artifact.
  */