feat: return typed refresh job results (#4013)

## Problem

`refresh_column_async` returned a unit-result job even though durable
refresh jobs carry a canonical terminal result. Python callers could not
obtain row counts or source and published versions through the public
`Job` API, and local and remote refresh jobs exposed different result
semantics.

## Behavior

`refresh_column_async` now returns `Job[RefreshColumnResult]` for local
and remote tables. The general typed-job bridge binds each endpoint to
its public result model while preserving unit-result jobs and existing
status, wait, cancel, and timeout behavior. A local no-op refresh
reports no published version.

The Node.js API continues to resolve `wait()` as `void`; its binding
erases the Rust result type internally to preserve the existing public
contract.

## Ownership and integration boundary

LanceDB owns the language-neutral `Job<T>` contract and language-binding
decode. Sophon owns production and durable persistence of terminal
payloads. Sophon #7348 and #7378 now publish the canonical refresh
result for Function-backed and expression-backed refresh jobs,
respectively. The remote client fixture matches the merged server
schema; live deployment and end-to-end demo acceptance remain separate
rollout checks.

python/python/tests/test_index.py

@@ -88,7 +88,7 @@ async def binary_table(db_async):
 async def test_create_index_async_returns_done_job(some_table: AsyncTable):
     job = await some_table.create_index_async("id", config=BTree())
     assert job.id is None
-    await job.wait()
+    assert await job.wait() is None
     assert len(await some_table.list_indices()) == 1
     await job.cancel()