Add new atvscript attributes to node_pyatv

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
- Feature
What is the current behavior? (You can also link to an open issue here)
- the attributes all_identififiers and mac that are part of the atvscript scan response, are not part of this library yet
What is the new behavior (if this is a feature change)?
- add the attributes to the library
Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
- breaks compatability with pyatv<=0.14.4
Other information:
- relates to https://github.com/postlund/pyatv/pull/2282

[x] My code follows the code style of this project
- Run npm run lint to double check
[x] My change requires a change to the documentation
- [ ] I have updated the documentation accordingly
- isn't the documentation generated from the comments fo the methods?
[x] I have added tests to cover my changes
- Run npm run test to run the unit tests and npm run coverage to generate a coverage report
[x] All new and existing tests passed
[x] My commit messages follow the commit guidelines

sebbo2002 / node-pyatv