yams #83813 Generic mechanism to add meta attribute related to another [validation pending]

``RichString`` use a dedicated hack but a generic mechanism would be nicer

A good candidate for using such mechanism is the ``Bytes`` attribute which is often associated with ``_format`` and ``_name`` metadata

prioritynormal
typeenhancement
done in0.35.0
load0.500
load left0.000
closed by#4d25fa7c13d9 add a generic mechanisme to specify metadata (closes #83813)