Update Hologres vector store: use hologres-vector (#13767)

Hi,
I made some code changes on the Hologres vector store to improve the
data insertion performance.
Also, this version of the code uses `hologres-vector` library. This
library is more convenient for us to update, and more efficient in
performance.
The code has passed the format/lint/spell check. I have run the unit
test for Hologres connecting to my own database.
Please check this PR again and tell me if anything needs to change.

Best,
Changgeng,
Developer @ Alibaba Cloud

Co-authored-by: Changgeng Zhao <zhaochanggeng.zcg@alibaba-inc.com>
Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>

docs/docs/integrations/providers/hologres.mdx

@@ -11,7 +11,7 @@
 Click [here](https://www.alibabacloud.com/zh/product/hologres) to fast deploy a Hologres cloud instance.
 
 ```bash
-pip install psycopg2
+pip install hologres-vector
 ```
 
 ## Vector Store

docs/docs/integrations/vectorstores/hologres.ipynb

@@ -22,7 +22,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "#!pip install psycopg2"
+    "!pip install hologres-vector"
    ]
   },
   {