SpacetimeDB
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CLI: Refactor and reuse `Arg` parsers to ensure consistent UX
Currently, parsers for e.g., --identity and friends are copy-pasted across our CLI code.
It would be good to deduplicate these so that:
- we cut down on code, which is good for readability and bug reduction.
- we ensure a consistent UX in terms of flags, types, help messages, etc. This way, we avoid subtle differences.