Add encoded 3D chart root overloads

Summary:
- add encoded-only chart root overloads for Scatter3D, Surface, Mesh3D, Cone, StreamTube, Volume, and IsoSurface
- wire encoded xyz, topology, vector-field, value, and opacityscale payloads through the existing trace-layer support
- add chart-level unit tests plus upstream 2.28 fixtures/assertions for the new 3D root constructors
- replace the console playground sample with a focused encoded Chart.Cone example

Verification:
- .\\build.cmd runTestsCore
- 864 tests passed

Author: kMutagene