Implement command to sync directory of rel files

[bradlo]

many people have asked for the ability to "synchronize" a folder of rel files (and maybe data?) with a database.

following are some notes on design work is needed before implementing the command/s.

design issues:

• fully recursive? or designated folder only? (or options for both?)
  • eg: rai sync ./rel/*.rel or ./rel/... or ?
• do we recognize when files have been changed on server to avoid overwrite (w/o warning)
  • consider recording sha256 of model file when its installed by cli, which we can then use to detect when it doesnt match currently installed model (meaning updated elsewhere) and/or where it doesnt match local file? (maybe this is too much mechanism)
  • .. if we do go down this path, we may need to compute hierarchical hashes (like git) for perf? maybe a slippery slope?
• explicit pull/push vs. "smart" sync? (maybe both?)
  • pull/push would overwrite (possibly with warning), sync would synchronize folder and directory with latest in each?

[billscheidel-rai]

Note: This issue has been migrated to https://relationalai.atlassian.net/browse/RAI-7197.

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