Decide on how config files should be structured

[seanchen1991]

Background

#3636 provides some good suggestions for how config files could be structured to better support many types of non-SDK chains. We could consider adopting some (or all) of the suggestions.

Tasks

• Decide on how config files should be formatted

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[romac]

We may also want to consider whether or not we want to stick with TOML or not.