write distributed_kmeans centroids and assignments to hive tables (facebookresearch#4017)

Summary:
Pull Request resolved: facebookresearch#4017

Exposing an option to run kmeans centroids and assignments to hive table which should bring us close in parity with Digraph's Kmeans API. This is needed for cluster balance data quality checks for large scale centroids

Reviewed By: kuarora

Differential Revision: D64835789

fbshipit-source-id: 95cbea00bb6b4733c03836049bc379be813bf9e5

Author: mengdilin

benchs/bench_fw/descriptors.py

@@ -83,6 +83,8 @@ class DatasetDescriptor:
 
     embedding_column: Optional[str] = None
 
+    embedding_id_column: Optional[str] = None
+
     sampling_rate: Optional[float] = None
 
     # sampling column for xdb