Function blosc2_create_dctx 

pub unsafe extern "C" fn blosc2_create_dctx(
    dparams: blosc2_dparams,
) -> *mut blosc2_context

@brief Create a context for *_ctx() decompression functions.

@param dparams The blosc2_dparams struct with the decompression parameters.

@return A pointer to the new context. NULL is returned if this fails.

@note This supports the same environment variables than #blosc2_decompress for overriding the programmatic decompression values.

@sa #blosc2_decompress