Does it make sense to an option on what type of bbox is desired by the user

[ayushgnv]

simulation_interfaces/srv/GetEntityBounds.srv

Line 4 in 172a1b1

string entity # Entity identified by its unique name as returned by GetEntities / SpawnEntity.

I think here adding an optional field allowing users to specify the BBOX_TYPE in the request is useful so a simulator can return that specified approximated BBOX type.

@adamdbrw @azeey @peci1 does that make sense? Happy to setup a PR if we agree.