feat: rebase and implement file API methods

Signed-off-by: Varsha Prasad Narsing <varshaprasad96@gmail.com>

docs/_static/llama-stack-spec.yaml

@@ -8095,6 +8095,19 @@ components:
         ttl_seconds:
           type: integer
           description: The time to live of the chunks.
+        params:
+          type: object
+          additionalProperties:
+            oneOf:
+              - type: 'null'
+              - type: boolean
+              - type: number
+              - type: string
+              - type: array
+              - type: object
+          description: >-
+            Optional parameters for the insertion operation, such as distance_metric
+            for vector databases.
       additionalProperties: false
       required:
         - vector_db_id