C API missing features

[beicause]

It seems some compression params are not available in the C API such as: m_swizzle, m_renormalize, m_mip_renorm, m_resample_*.

In addition, the docs say:

The current C API doesn't support also specifying user-specified mipmaps for these texture types (however the full C++ API does), but it does support automatic mipmap generation.

[richgel999]

The C++ API is definitive API, everything else is a wrapper on top of that. See basis_compressor_params and basis_compressor.

The long term plan is to expose all the parameters to C/WASM/Python clients, but it'll take some API work.