WIP: Rhythm ingest path

[mdisibio]

What this PR does:
Main focus is making everything work in SingleBinary mode for easy debugging.

• Assume partition 0 without need to configure block builder assigned partitions or host name to include a parseable number
• Fix block-builder startup error where the block builder caused a module failure before the ingester had time to create the partition. This was because the block-builder was treating a consumeCycle error as a hard module failure. Now it keeps retrying on a timer.
• Validate config on startup, to make missing fields more clear
• Repair tests

Which issue(s) this PR fixes:
Fixes #

Checklist

• Tests updated
• Documentation added
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]