Add skeleton support for native functions

[SpecLad]

Motivation and context

All of the support code in the auto-annotation SDK layer is already there, we just need to send sublabel information when creating a native function, and validate it when running an agent.

In addition, force keypoint sublabel types to be "points", since this is how the UI creates them for tasks/projects.

How has this been tested?

Tests will be added in the private repository.

Checklist

• I submit my changes into the develop branch
• I have created a changelog fragment
• I have updated the documentation accordingly
• I have added tests to cover my changes
• [ ] I have linked related issues (see GitHub docs)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud