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d9018067b3
### Description Stacked on #3490. Adds an optional version to branch checkout across the Rust core and the Python and TypeScript SDKs, so you can open a specific version on a branch ("version V of branch B"), not just the branch's latest version Rust ```rust // Open version 3 of branch "exp" (a read-only view): check out from an // existing table, or open it directly from the connection. let exp_v3 = table.checkout_branch("exp", Some(3)).await?; let exp_v3 = db.open_table("items").branch("exp").version(3).execute().await?; // checkout_latest re-attaches to the branch's writable HEAD. exp_v3.checkout_latest().await?; // With no branch, a version opens main at that version. let main_v3 = db.open_table("items").version(3).execute().await?; ``` Python ```python # Open version 3 of branch "exp" (a read-only view): check out from an # existing table, or open it directly from the connection. branch_v3 = await table.branches.checkout("exp", version=3) branch_v3 = await db.open_table("items", branch="exp", version=3) # checkout_latest re-attaches to the branch's writable HEAD. await branch_v3.checkout_latest() # With no branch, a version opens main at that version. main_v3 = await db.open_table("items", version=3) ``` TypeScript ```typescript // Open version 3 of branch "exp" (a read-only view): check out from an // existing table, or open it directly from the connection. const branchV3 = await (await table.branches()).checkout("exp", 3); const opened = await db.openTable("items", undefined, { branch: "exp", version: 3 }); // checkoutLatest re-attaches to the branch's writable HEAD. await branchV3.checkoutLatest(); // With no branch, a version opens main at that version. const mainV3 = await db.openTable("items", undefined, { version: 3 }); ``` ### Testing - Added unit tests (Rust, Python sync + async, TypeScript): branch-scoped resolution at a version number shared with `main` and with another branch, read-only enforcement on a pinned handle, `checkout_latest` recovery to the branch's HEAD, fork-point reads, and the nonexistent-version/branch error paths. - Ran smoke tests against the Python and TypeScript SDKs on local machine.