Add partition range filter to rill project refresh

[rohithreddykota]

Adds --partition-key, --partition-start, and --partition-end flags to rill project refresh so a contiguous range of incremental-model partitions can be refreshed without having to look up each MD5 partition key by hand.

• Resolves partitions client-side: lists every partition of the target model, filters by data[<key>] against [start, end] (inclusive, lexicographic string compare), prints the matched rows, and asks for confirmation before triggering. --yes skips the prompt for scripted use.
• Reuses RefreshModelTrigger.Partitions end-to-end — no proto, admin, or reconciler changes.
• Mutually exclusive with --partition / --errored-partitions; requires exactly one --model; enforces the existing "model must be incremental" check.

Example:

```
rill project refresh --model my_model \
--partition-key date \
--partition-start 2026-03-02 \
--partition-end 2026-03-08
```

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!

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Developed in collaboration with Claude Code