[cascade] add checkpoint persistence implementation #157
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adds a few new message types between controller to executors -- DatasetPersistCommand, Success, Failure, ...
implements the "if dataset marked to be persisted, then:
1/ always publish it even fused
2/ dont purge if to be published
3/ once published for the first time, issue persist command
" etc
only single implementation of persist client for now -- locally mounted filesystem
a minor naming change in the gateway API -> best we merge this before we update fiab-ekw dependency
for the reviewer: probably just skim through this :) Lot of code but nothing surprising