Describe the bug

The access to internal owned object can be performed in two ways: ro and rw. For example for the z_owned_sample_t the mentods z_sample_payload(const z_loaned_sample_t*) and z_sample_payload_mut(z_loaned_sample_t*). The second one allows to perform z_take operation to process the payload outside of the sample.

It's necessary to:

• provide the same method for attacment for api completeness.
• review the api: check if all mehods for accessing internal owned object have both const and mut accesors

To reproduce

System info