Feat: Add metadata filtering function for /api/v1/retrieval (#9877)

-Added the metadata_dedition parameter in the document retrieval
interface to filter document metadata -Updated the API documentation and
added explanations for the metadata_dedition parameter

### What problem does this PR solve?

Make /api/v1/retrieval api also can use metadata filter

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

docs/references/http_api_reference.md

@@ -1808,7 +1808,8 @@ Retrieves chunks from specified datasets.
   - `"rerank_id"`: `string`  
   - `"keyword"`: `boolean`  
   - `"highlight"`: `boolean`
-  - `"cross_languages"`: `list[string]`  
+  - `"cross_languages"`: `list[string]`
+  - `"metadata_condition"`: `object`
 
 ##### Request example
 
@@ -1855,7 +1856,8 @@ curl --request POST \
   - `false`: Disable highlighting of matched terms (default).
 - `"cross_languages"`: (*Body parameter*) `list[string]`  
   The languages that should be translated into, in order to achieve keywords retrievals in different languages.
-
+- `"metadata_condition"`: (*Body parameter*), `object`
+  The metadata condition for filtering chunks.
 #### Response
 
 Success: