Move Conversations tool out of experimental status and into Core tools

This is a roll up Jira to track the process of moving Conversations out of experimental status. Any blockers or other critical feature requests associated with this tool can be linked to this issue for ease of tracking. I’ve linked a few existing issues. Please link additional issues as needed.

The Conversations tool is currently being used by more than 2 institutions, and I think it is ready to move out of experimental status for Sakai 23. Once it is available as a non-experimental, non-stealthed tool, more institutions are likely to use it. While Conversations might not be quite ready to replace Discussions, making it part of regular Core tools will allow more users to try it out and provide feedback on the tool and submit issues about additional Conversations features and enhancements.