Add capability to `PairInterface` to modify naming at time of `addSubInterface`

[mkorbel1]

Motivation

The option to expose modify is up to the constructor of an interface extending PairInterface, but at the time of adding a sub-interface is likely a point where people may want to uniquify them (e.g. multiple instances of a sub-interface).

Desired solution

Add some sort of uniqify or modify in PairInterface.addSubInterface.

Alternatives considered

No response

Additional details

No response