feat: remote index stats (#1702)

BREAKING CHANGE: the return value of `index_stats` method has changed
and all `index_stats` APIs now take index name instead of UUID. Also
several deprecated index statistics methods were removed.

* Removes deprecated methods for individual index statistics
* Aligns public `IndexStatistics` struct with API response from LanceDB
Cloud.
* Implements `index_stats` for remote Rust SDK and Python async API.

node/src/remote/client.ts

@@ -17,7 +17,7 @@ import axios, { type AxiosResponse, type ResponseType } from 'axios'
 import { tableFromIPC, type Table as ArrowTable } from 'apache-arrow'
 
 import { type RemoteResponse, type RemoteRequest, Method } from '../middleware'
-import { MetricType } from '..'
+import type { MetricType } from '..'
 
 interface HttpLancedbClientMiddleware {
   onRemoteRequest(

node/src/remote/index.ts

@@ -526,8 +526,7 @@ export class RemoteTable<T = number[]> implements Table<T> {
       numIndexedRows: body?.num_indexed_rows,
       numUnindexedRows: body?.num_unindexed_rows,
       indexType: body?.index_type,
-      distanceType: body?.distance_type,
-      completedAt: body?.completed_at
+      distanceType: body?.distance_type
     }
   }