feat(Cosmos, propulsion sync): propagate unfolds

[bartelink]

Adds APIs to EquinoxSystemTextJsonParser to enable parsing Unfolds held in Tip documents

Uses #264 and jet/equinox#460 to make propulsion sync also copy Unfold data, i.e. being able to copy snapshots and/or RollingState data

Commandline defaults changed to align with this:

• need to opt out of copying unfolds via -E
• flipped 'IncSys' to 'ExcSys'; default sync does not attempt to filter $-prefixed stream names (the semantic is now to copy all the things, not simulate what a projector might do)
• Timeout before ChangeFeed starts extended from 10s to 30s