Add encoded Trace3D fields

Summary:
- add encoded typed-array support for Scatter3D, Surface, Mesh3D, Cone, StreamTube, Volume, and IsoSurface
- wire common Ids/X/Y/Z/CustomData/MultiText encoded fields plus vector-field U/V/W, mesh topology I/J/K/Intensity, and volumetric Value arrays
- add flattened OpacityScaleEncoded support for Surface, Volume, and IsoSurface using EncodedTypedArray shape metadata
- extend low-level encoded array tests, upstream PlotlyJS 2.28 feature fixtures/assertions, and the FSharpConsole manual demo with an encoded cone example

Verification:
- .\\build.cmd runTestsCore
- 780 tests passed
- Plotly.NET build completed with 0 F# XML-doc warnings

Author: kMutagene