Pass through BigBlueButton error messages

[richp10]

Is your feature request related to a problem? Please describe.
When things go wrong it is very difficult to understand the problem without the BigBlueButton error messages.

Describe the solution you'd like
Pass through the message and messageKey values on the Next error page

Describe alternatives you've considered
The only alternative is to pick through server logs this requires server side permissions and limits range of people who can make sense of what is going on.

Additional context
As an example of why this matters: calls to Create meeting request are Idempotent - so can be called multiple times. However, if you change the values of the call request it fails with an error. Most plugins display this error so you can see what the problem is. In this plugin this is hard to diagnose.