Rocketmq metadata and test refactor

[jaydeluca]

Part of #14096 and #14128

notes:

• There was an unnecessary nesting (rocketmq:rocketmq-client:rocketmq-client-{version}) so I removed the redundant rocketmq-client level.
• I needed to add a short sleep to the tests to get them to pass locally
• I am going to continue documenting the configuration options as they were before the recent declarative config refactor, as I'm still working out how to handle the new declarative config paradigm in the context of metadata, and will need to go through and redo all the modules soon to account for that
• I know our nightly job keeps running out of disk space and adding additional modules is not going to make that situation any better, but I have something in the works that I'm still testing to help with that