[WIP] Simplify Config

[akshaymankar]

TODO:

• Reorganize configs across all services so they're neatly nested into domain specific configs
• Make all binaries accept the same config
• Add defaults for every config option into haskell code
• Adapt the wire-server helm chart to use the new config, feel free to break compat
• Write some tool (maybe another helm chart?) to translate current way of configuring the wire-server helm chart into the new config.
• Document migration using the new tool.
• Write meaningful docs for each config option. See if we can generate some kind of rendered html out of it (can be a separate PR).

Checklist

• Add a new entry in an appropriate subdirectory of changelog.d
• Read and follow the PR guidelines