chore: Refactor email and provision

[eikek]

• refactors message handler code: moved parts into their own building blocks. MessageHandlers is the entry point for defining all message handlers that can be composed from various utilities based on fs2.Stream|Pipe
• Remove the default events queue name. Now starting up fails, if queue names are not correctly configured
• Remove email from the user document so it's not stored in solr
• When updating documents, score must be unset. Could be better modelled, given this big pr already it's only reset now
• updates dev setup and adds more scripts for playing around
• fixes issue where searching doesn't return results for certain terms due to wrong casing

[jachro]

👍🏻