toArgs
Creates a new GBytes
args from the current state of the given @builder.
Any uniforms of the shader that have not been explicitly set on the @builder are zero-initialized.
The given GskShaderArgsBuilder
is reset once this function returns; you cannot call this function multiple times on the same @builder instance.
This function is intended primarily for bindings. C code should use method@Gsk.ShaderArgsBuilder.free_to_args.
Return
the newly allocated buffer with all the args added to @builder