Improve Shader integration samples

[Ipotrick]

Additional Samples:

• bindless handle upload methods (push constant, constant buffer, buffer)
• binldess handle access in shaders (pass to functions, store in local variable, store in buffer, store in struct)
• bindless handle transport (write handles into buffer, following shader reads handles and uses them)
• showcasing handle operations (id_to_index and others)
• showing constant buffer use

[Ipotrick]

added test 9_shader_integration::bindless_handles