[Feature request]: Remove rmf_robot_sim_common package

[luca-della-vedova]

Before proceeding, is there an existing issue or discussion for this?

• I have done a search for similar issues and discussions.

Description

The rmf_robot_sim_common package is no longer necessary since we don't need to support gazebo classic anymore, on the contrary it makes the code for plugins unnecessarily complicated (i.e. having a callback based system for ingestors / dispensers).
We should get rid of it, which will remove one package from this repo and make the code quite a lot easier to maintain.

Implementation Considerations

No response

Alternatives

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Additional information

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[pranavk-2003]

I'm interested in working on this,can i get a head's up, or anything which would get me started. @luca-della-vedova

[luca-della-vedova]

Hello! #139 can be an example on how to do it for some packages, basically plugins such as slotcar are split into a common and a gz package, this would be about unifying them into just the gz package and removing the common package.