namb v2: Allow for encoding head_dilation. Making functions compatible for embedded devices

[edwillys]

Bumping the .namb binary format to version 2, which includes following features:

• Encode WaveNet head_dilation
• Refactor the binary loader for embedded use (no filesystem or JSON dependencies in get_dsp_namb.cpp)
• Add inspect_namb() and structured model metadata APIs for inspecting architecture, layer, and configuration details without constructing the DSP.
• Expand loadmodel to support .nam and .namb files, verbose architecture inspection, and runtime memory estimates configurable by audio buffer size.
• Improve WaveNet memory reporting with detailed estimates for ring history, condition buffers, layer workspaces, outputs, and total runtime memory.
• nam2namb command-line now handles SlimmableContainer submodel selection/reporting.
• Add Windows/MSVC CMake support