* (M) protomap/integration_tests/integration_test.go
  - Add test case for a failure that was causing a panic,
    where a leaf-list of union values was being handed to
    PathsToProto. Currently not yet implemented, but test
    checks error handling works as expected.
 * (M) protomap/proto(_test)?.go
  - Add support and testing for mapping of leaf-lists of
    YANG inbuilt types to protobufs.

* Add support for mapping leaf-lists of unions to protobufs.

 * (M) integration_tests/integration_test.go
  - Reflect the fact that the gRIBI integration test cases is now
    implemented.
 * (M) protomap/proto.go
  - Add support for mapping both []any and gNMI TypedValue messages
    to fields within a protobuf from input gNMI paths.
 * (M) protomap/testdata/...
  - Additional fields in test protobufs.

* Add outdated file.

* Remove stale output.

* Improve test coverage - add handling for bool.